This is the 5346th most frequent Chinese word.
交卷
To hand in an exam paper.
In this sentence, '交卷' refers to the action of submitting completed test papers or exams by the students.
学生们在铃声响起前纷纷将自己的试卷交卷。
The students handed in their test papers before the bell rang.
Here, '交卷' is used to indicate the act of submitting test papers at the end of the exam as part of the instructions provided by the teacher.
老师要求大家在考试结束后立刻交卷，以保持公平性。
The teacher asked everyone to hand in their test papers immediately after the exam ended to ensure fairness.
In this example, '交卷' describes the formal submission of answer sheets or documents within a specified timeframe in a competitive setting.