adj.
活泼的, 活跃的; 积极的
She is an active girl.
她是一位活泼的姑娘。
起作用的
His pulse is low, but his heart is still active.
他脉搏很弱, 但心脏还跳着。
主动的
This sentence is in the active voice.
本句子用的是主动语态。