题目内容
n. a vehicle that travels in space
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n. a plan or system for doing or organizing sth.v.to make secret plans to do sth. that will help yourself and possibly harm others
a. (of a slope, hill, etc.) rising or falling quickly, not gradually
vi.to look at sb. /sth. for a long time
v. to move slowly from side to side; to move sth.in this way
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