He's completed 30 years of active military service.
他已经服完30年的现役。
The virus is still active in the blood.
这种病毒仍然在血液中起作用。
Although he's nearly 80, he is still very active.
尽管快80岁了，他还是十分活跃。
She plays an active part in local politics.
她积极参与地方政治活动。
They took active steps to prevent the spread of the disease.
他们采取积极措施，防止疾病蔓延。