Horseplay is OK at work as long as are off the clock.

馬球是只要你的工作確定的關閉時鐘.

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After the horseplay by the wicked students, the classroom floor was strewn with crumbled chalk dust.

那班頑皮學生鬧著玩兒,捏碎不少粉筆,過后, 教室地板上撒滿了粉筆灰.

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