考生必须留在座位上，等所有试卷收好以后方可离去。
Candidates shall remain in their seats until all the papers have been collected.
考试结束后，老师把试卷收上来并及时评分。
At the end of the exam, the teacher collected the papers and graded them in time.
两套数据采用两份不同的问卷收集得到。
These data are collected using two different sets of questionnaires.
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