Nonpolluting
a. 不会引起污染的
🗣️ 情景例句
Concerned about whom?
为谁担心
He often plays cards.
他常常玩扑克牌。
People woken during these periods of eye-movements generally reported that they had been dreaming.
在眼球活动期间被叫醒的人都说自己在做梦；