hand in:上交;递交
1.As for cheating, teachers can ask students to hand in their iPads when they take exams. 至于作弊,老师可以要求学生考试时上交他们的ipad。
hand up: 举手
1.And I kept my hand up because I did the reading and knew the answer. 我一直把手举着,因为我温习过知道答案。
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