The professor mentions a conversation between two servants in order to explain how playwrights develop the obligatory scene of a well-made play.
教授提到了两个仆人之间的对话，以解释剧作家如何建立起一部好剧本中必不可少的场景。
A properly arranged school curriculum, like a cookbook on nutritionally well-balanced food, must include all the useful and indispensable courses — courses which are equally important and obligatory.
一个合理编列的课程表，犹如一个营养均衡的食谱，里面各个项目都是有益而必须的，不可偏废，不可再有选择。
As well as going to bed an average of 30 minutes later, the children who took obligatory naps were more likely to be moody in the morning and resist going to school, according to their parents.
根据父母们的反馈，每天午睡的儿童晚上同样平均晚睡30分钟，早上起床上学时也更容易闹脾气，表现得很抗拒。
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