笔者观察了两个英语专业班级连续几个月的口语课堂教学，并在结束时做了一份问卷。
The author had observed for several months the oral English training sessions of two groups of sophomores majoring in English before the questionnaire was delivered to them.
所有事件处理程序都在关联范围开始时启用并在关联范围结束时禁用。
All event handlers are enabled when the associated scope starts and disabled when the scope ends.
家庭作业会在每堂课结束时布置，并在下次课之前上交。
Homework will be assigned at the end of each class and is due at the beginning of each lecture.
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