题目内容
adj.at or near the back of sth. ; n. the back part of sth.
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v. to rub your skin with your nails, usually because it is itching; n. a mark, a cut or an injury made by scratching sb. 's skin or the surface of sth.
n. an area of activity, interest, or knowledge
v. to make a copy of a picture, piece of text, etc.
vt. to give up sth. that is important or valuable to you in order to get or do sth. that seems more important for yourself or for another person
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