adj(1)活跃的，精力旺盛的(able or always ready to do things or to take action;energetic)：Although she is quite old she's still very～.她虽然已年迈，却仍然很活跃。a very～child一个精力非常充沛的孩子;Athletes are more～than office workers.运动员比坐办公室的人爱活动。lead an～life 过有活力的生活;He's taking an～part in school affairs.他正积极参与学校的事务。be～in a revolution/community affairs/doing sth 积极参加革命/社区服务/做某事;be～in Conservative Party 积极参与保守党的活动;be an～supporter of women's rights 是妇女权益的积极支持者;be an～member of a club 是一个俱乐部的积极成员;soldiers on～service(BrE)/duty(AmE)在服现役(尤指战时)的士兵;〖同〗energetic，vigorous，lively;〖反〗inactive，lazy;

(2)敏捷的，灵活的(quick;lively)：She may be eighty，but she has an～mind/brain.她可能有80岁了，但头脑很敏捷。〖同〗quick，vigorous，alive，lively;〖反〗slow，dull;

(3)活动中的(functioning;working;in operation)：an～volcano 活火山;The volcano is no longer very～.这火山不再常爆发了。～cells in living plants and animals 成活的动植物中的活细胞;〖同〗functioning，working，acting;〖反〗inactive;

(4)能起作用的，活性的(able to cause an effect or effects;not merely passive)：Yeast is an～ingredient of bread.酵母是面包的活性成分。The chemical is still～.那化学药品还未失效。an～element 活跃元素;～resistance 积极抵抗;

(5)主动的(having the person or thing doing the action as the subject)[无comp](gram)：the～voice 主动语态;The verb here is～.这个动词是主动语态。〖反〗passive;

← act v;

→′actively adv 活跃地，积极地;′activeness n 活跃;ac′tivist n(政治等)积极分子;ac′tivity n 活力;活动;

n主动语态(active form of a verb)[U，the～](= active voice)(gram)：The verb in this sentence is in the～.这个句子中的动词是主动语态。put a sentence into the～把句子变成主动语态;

【辨异】active与energetic和vigorous都可表示“精力充沛(旺盛)的”。active含有“勤奋”、“迅速”的意思(与 “懒惰”、 “迟缓”相对而言)，如：an active person　(活跃的人);energetic　(精力充沛的)指热烈有力，有时是神经质的活动，如：conduct an energetic campaign(组织一次热烈的活动);vigorous(充满活力的)指强而有效的活动，如：vigorous exercise(生机勃勃的锻炼)。