REPEAT语句定义了一个语句集合，如果在 REPEAT 循环结束时某个条件的求值结果为true，那么就将执行这个语句集合。
The REPEAT statement defines a set of statements to be executed until a condition that is evaluated at the end of the REPEAT loop is true.
如果有一个为真了，相应的分支语句就运行了，这些条件判断的语句就都结束了。
If one of them is true, the corresponding branch runs and the statement ends.
如果有一个为真了，相应的分支语句就运行了，这些条件判断的语句就都结束了。
If one of them is true, the corresponding branch runs and the statement ends.
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