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TOEFL BNC: 1316 COCA: 1444
active adj.
active (the active ingredient in aspirin) busy1 (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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