循环控制结构可以定义为：当一个条件为真时，重复地完成一组指令。
The repetition control structure can be defined as the presentation of a set ofinstructions tobe performedrepeatedly, as longas acondition is true .
如果一个条件指令是一组指令中的第一条指令，则该条件适用与该组中的所有指令。
If a conditional command is the first command in a group of commands, the condition applies to all the commands in the group.
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