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essential oil n. 精油。
relax 是及物动词，意为“放松, 使 ... 放松”，例如：
The music will help to relax you.
音乐会使你感到轻松。
drop n.滴
be supposed to 应该
He is supposed to be back at the base by seven.
他应该在7点以前回到基地.
essence n.香精
smell vi 有某种气味
The flowers smell sweet.
这些花很香。
