题目内容
n. the limits between which sth. varies; v. to vary between two particular amounts, sizes, etc. , including others between them
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v. to decay, or make sth. decay, naturally and gradually; n. the process or state of decaying and falling apart
a. in its natural state; not yet changed, used or made into sth. else
n. a small amount of sth. that shows what the rest of it is like
n. the top layer of the earth in which plants, trees, etc. grow; v. to make sth. dirty
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