Student 1: Well, I guess that must be optional, because I don't see it on the requirements list. Okay, we should start planning our class presentation since that counts for half the grade.

（学生甲）我觉得那一定是非强制性的，因为我在作业要求里没有看见过这一项。我们应该开始准备课堂演讲了，毕竟这个占了总分的一半呢。