This indicates that the BankAccount class is an abstract class and the withdrawal method is an abstract operation.

这表示，BankAccount 类是一个抽象类，而withdrawal方法是抽象的操作。

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The observant reader will notice that the diagrams in Figures 4 and 5 use italicized text for the BankAccount class name and withdrawal operation.

细心的读者会注意到，在图4和图5中的图中，类名BankAccount和withdrawal操作使用斜体。

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There is usually a set time within which you can withdraw from the class, and if you withdraw after that time, it will influence your grade. This period for withdrawal is different at every school.

退课也有一定的时间限制，超过一定时间对你的成绩还是会有影响，各个学校对那个时间限制的要求有所不同。

youdao

With most of the former political class now behind bars, the withdrawal of the army from politics and a lifting of the state of emergency would carry the risk of retribution.

ECONOMIST: The generals show who's boss