She didn't hand in her first two assignments for chemistry, which started her out in the class with a failing grade.
她头两次的化学作业都没有交，这使她开始这门课时成绩就不合格。
For instance, one teacher ideally stays with a class from first grade through sixth grade.
比如，一个老师会一直跟随一个班级，从一年级直到六年级。
The dean says that they will bring an interesting perspective to the class, although, at least half jokingly, he worries about the first time he has to give either a bad grade.
该教务长说他们将为课堂增加更有趣的视角，尽管这是他第一次开始担心可能会给他们中的某个打低分。
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