这个列表相当简单,并且您可能从其他编程语言认识了这些流控制语句。
This list is fairly simple, and you may recognize these flow control statements from other programming languages.
如果条件的求值结果为TRUE,那么就将执行语句列表,在循环的顶部恢复控制。
If the condition evaluates to TRUE, the statement list is executed, then control resumes at the top of the loop.
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