题目内容
a. in its natural state; not yet changed, used or made into sth. else
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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
vi.to hit your foot against sth. while you are walking or running and almost fall; to walk or move in an unsteady way
v. to feel and show that you are sorry for sth. bad or wrong that you have done
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