题目内容
n. a system of words, letters, numbers or symbols that represent a message or record information secretly or in a shorter form
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n. a series of circles formed by winding up a length of rope, wire, etc; v. to wind into a series of circles; to make sth. do this
n. a person, team, etc. that has won a competition, especially in a sport
v.to question whether a statement or an action is right, legal, etc; to refuse to accept sth.; n. a new or difficult task that tests sb.'s ability and skill
n. two or more things joined or mixed together to form a single unit
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