active的副词形式是什么意思

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

　　尽管快80岁了，他还是十分活跃。

　　Learning has got to be active and experiential.

　　学习得是主动且来自经验的。

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

　　咖啡因是茶和咖啡这类饮品的活性成分。