告诉你的朋友他们应该在课堂上多做笔记，而不是告诉他们本应为了那一场没有及格的历史考试努力学习。
Tell your friends they should take more notes in class instead of talking about how they should have studied harder for the big history exam they failed.
一场新的考试就要到了，老师正让我们作准备，我们也在努力学习为它作准备。
A new exam is coming. Our teachers are preparing us for it and we are studying hard to prepare for it.
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
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