REM sleep is termed 'active' sleep.
快速眼动睡眠称作“主动”睡眠。
Yogurt is made from active cultures.
酸奶是由活性培养菌制成的。
He has dropped out of active politics.
他已不再积极参政了。
She's very active, considering her age.
就她的年龄来说，她是十分活跃的。
She takes an active part in school life.
她积极参加学校活动。