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TOEFL BNC: 1316 COCA: 1444
active
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adjective /ˈæktɪv/
  1. 1
    someone who is active does a lot of different activities and has a lot of energy and interests 积极的；活跃的

    People are remaining active into later life. 人们到了晚年仍很活跃。

    meditation techniques to keep the mind active and alert 保持头脑活跃和警惕的沉思技巧

     Synonyms and related words
    Energetic and lively: energetic, lively, active...
    1. a.
      very involved in the work of an organization or with a particular activity 积极的；热心的
      active in :

      She continues to be active in politics. 她依旧活跃于政坛。

      active member :

      He is an active member of the American Cancer Society. 他是美国癌症协会的积极分子。

       Synonyms and related words
      Busy and working: busy, active, tied up...
    2. b.
      used about a period or event that is full of busy activity （活动和时间段）剧烈的，充实的

      We had a very active weekend. 我们过了个非常充实的周末。

       Synonyms and related words
      Busy places and times and describing busy places and times: madhouse, a hive of activity, the centre of activity/things...
  2. 2
    taking positive action in order to make something happen, rather than just hoping that it will happen 在进行中的；在起作用的；切实的

    There are already active discussions going on. 讨论已经在进行了。

    Active steps are being taken to calm the situation. 已经采取了切实的行动以平息局势。

    We couldn't have organized the show without the active support and participation of the students' parents. 没有学生家长的积极支持和参与，我们就无法组织演出。

     Synonyms and related words
    Involved in something: concerned, active, involved...
  3. 3
    operating or working in a particular area or at a particular time （在某一地区或某一时间内）活动中的

    Pickpockets are known to be active in the area. 该地区以小偷活动猖獗而著称。

     Synonyms and related words
    Existing, happening or being dealt with now: existing, present, immediate...
    1. a.
      regularly doing a particular activity 周期性的进行（某项活动）
      sexually active (=having sex regularly) :

      sexually active young women 性活跃的年轻女性

       Synonyms and related words
      Busy and working: busy, active, tied up...
    2. b.
      an active electrical system is working （电路系统）在运转中的

      The burglar alarm becomes active ten seconds after you set it. 防盗警报在设置后10秒钟启动。

       Synonyms and related words
      Electricity and electrical power: AC, active, alternating current...
  4. 4
    an active volcano is likely to erupt (=explode and pour out fire) at any time. When a volcano no longer does this, it is extinct. （火山）活的
     Synonyms and related words
    Volcanos: active, crater, dormant...
  5. 5
    chemistry producing a chemical or biological reaction 活性的

    What is the active ingredient in detergents? 洗涤剂中的活性成分是什么？

     Synonyms and related words
    Describing chemicals and chemical processes: active, aerobic, alkaline...
  6. 6
    linguistics in active verbs or clauses, the subject is the person or thing that does or is responsible for the action of the verb. For example in the sentence ‘The crowd was making a bit of noise throughout the game', the verb group ‘was making' is active, and the clause is in the active voice. 主动语态的
     Synonyms and related words
    Describing types and forms of verbs: active, causative, ditransitive...
    See also passive
TOEFL BNC: 1316 COCA: 1444
active

adjective

VERBS | ADVERB | PREPOSITION VERBS➤be活躍▸➤become變得活躍▸➤keep (sb), remain, stay（使某人）保持／仍然／依然活躍◇Try to keep active in the cold weather.天冷時要盡量多活動。ADVERB➤extremely, fairly, very, etc.極其／相當／非常活躍▸➤highly十分活躍◇a highly active volcano十分活躍的火山➤increasingly越來越活躍▸➤mentally, physically思維／身手敏捷◇It's important to remain mentally active after retirement.退休後保持敏捷的思維是十分重要的。➤sexually定期有性行為的◇By the age of 18, 65% of teenagers report being sexually active.65% 的青少年報稱 18 歲之前已定期有性行為。➤economically, politically經濟上活躍的；政治上積極的◇When did you first become politically active?你是什麼時候開始投身政治的？PREPOSITION➤against對⋯起作用◇drugs that are active against cancers對治療癌症有效的藥物➤in在⋯方面表現積極◇She has been active in local politics for some years.她數年來一直活躍於當地政壇。
TOEFL BNC: 1316 COCA: 1444
active adj.
⇨ active (the active ingredient in aspirin) ⇨ busy 1 (active in politics) ⇨ energetic (physically active) active

adjective

active ♦︎ in operation ♦︎ in force ♦︎ in action ♦︎ up and running ♦︎ operationalThese words all describe sb/sth being able to do, or doing, the activity or work that is typical for them. 这些词均表示发挥功效或起作用。■ active doing sth regularly; functioning; having or causing a chemical effect 定期进行的；起作用的；起化学作用的◆These animals are active only at night.这些动物只在夜间活动。◆Numbers of sexually active teenagers have continued to rise.有性行为的青少年人数持续增加。◆The virus is still active in the blood.病毒仍然在血液中起作用。◆What is the active ingredient in aspirin?阿司匹林中的有效成分是什么？ OPP inactive ⓘ Inactive describes sb/sth that is not doing anything, is not in use or not working or has no effect. * inactive指不活动的、不使用的、不起作用的◆Some animals are inactive during the daytime.有些动物白天不活动。◆an inactive drug / disease失效的药物；非活动性疾病 ■ in opeˈration

idiom

 (rather formal) (of a system) working, being used or having an effect （系统）工作中，使用中，有效◆The system needs to be in operation for six months before it can be assessed.此系统须运行六个月后才能对它进行评估。◆Temporary traffic controls are in operation on New Road.“新路”正实施临时交通管制。ⓘ When a system comes into operation it starts working or having an effect. * come into operation表示开始运行或开始生效◆The new rules come into operation from next week.新规定下周开始生效。When you put sth into operation you start using it or make it start working. * put sth into operation表示开始使用或启动◆It's time to put our plan into operation.该是执行我们计划的时候了。   see also operate ⇨ organize , operate ⇨ work verb 3 ■ in ˈforce

idiom

(of a law or rule) being used （法律或规定）有效力，实施中◆The new regulations are now in force.新规定现已生效。ⓘ When a law or rule comes/enters into force it starts being used. * come/enter into force表示法律或规定开始实施◆When do the new regulations come into force?新规定何时开始执行？When you bring sth into force you make a law or rule start being used. * bring sth into force表示使法律或规定开始生效◆They are hoping to bring the new legislation into force by the end of the year.他们希望在年底前实施新法。 ■ in ˈaction

idiom

(of a person or thing) doing the activity or work that is typical for them （人或物）在活动中，运转中◆I've yet to see all the players in action.我还得看所有参赛者实地比赛。■ ˌup and ˈrunning

idiom

(of a system, for example a computer system) working; being used （系统，如计算机系统）在运转，在使用中◆By that time the new system should be up and running.到那时，新系统应该已经运转起来了。ⓘ Up and running is usually used to talk about sth starting to work or be used after a period of development. * up and running通常指经过一段时间的研发后开始运转或使用。   see also run ⇨ work verb 3 ■ operational [not usually before noun] (rather formal) ready to be used; in use 可使用；在使用中◆The new airport should be fully operational by the end of the year.新机场应该会在年底前全面投入运营。ⓘ Operational is very often used in the phrase fully operational. * operational经常用于短语fully operational中。   see also operate ⇨ work verb 3

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