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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

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