Although he's nearly 80, he is still very active.

　　盡管快80歲了，他還是十分活躍。

　　Learning has got to be active and experiential.

　　學習得是主動且來自經(jīng)驗的。

　　Caffeine is the active constituent of drinks such as tea and coffee.

　　咖啡因是茶和咖啡這類飲品的活性成分。