Rarify
vt. 使成精細；使變稀薄\\nvi. 變稀薄；純化
??? 情景例句
The cradle will rock.
搖籃跟著晃。
To smoke marijuana (dope, grass, pot)
吸食大麻
I repeated my question several times and at last he understood.
我把問話重復了很多遍。他終于聽懂了。