音标：['æktiv]
a. 活跃的, 起作用的, 积极的, 有效的, 主动的, 活性的, 现行的, 现役的
n. 主动语态, 积极分子
【医】 有效的; 活性的
英汉词典

active的短语、例句：

active adj 1 (a) (in the habit of) doing things; energetic （惯於）做事的; 精力旺盛的; 积极的; 活跃的
Although he´s quite old he´s still very active. 他虽然老了, 可仍闲不住.
lead an active life, ie one full of activity 过著活跃的生活
She takes an active part (ie is energetically involved) in local politics. 她积极参加本地的政治活动. (b) quick; lively 迅速的; 活跃的
have an active brain 头脑灵活. 2 functioning; in operation 起作用的; 操作中的
an active volcano, ie one that erupts occasionally 活火山. 3 having an effect; not merely passive 有效的; 主动的
the active ingredients 有效成分
active resistance 积极抵抗. 4 radioactive 放射性的. 5 (grammar) of the form of a verb whose grammatical subject is the person or thing that performs the action, as in He was driving the car and The children ate the cake 主动语态的（动词的一种形态, 其语法上的主语为施动的人或物, 如 He was driving the car及The children ate the cake等句）. Cf 参看 passive. active, n [sing] (also active voice) (grammar) active(5) forms of a verb 动词的主动语态形式
In the sentence `She cleaned the car´ the verb is in the active. 在She cleaned the car句中, 动词是主动式. Cf 参看 passive voice (passive).