REM sleep is termed 'active' sleep.

　　快速眼動睡眠稱作“主動”睡眠。

　　Yogurt is made from active cultures.

　　酸奶是由活性培養菌制成的。

　　He has dropped out of active politics.

　　他已不再積極參政了。

　　She's very active, considering her age.

　　就她的年齡來說，她是十分活躍的。

　　She takes an active part in school life.

　　她積極參加學校活動。