另一种常见的算法结构是当条件为“真”时，循环执行一条语句或者语句序列。
Another common algorithmic structure involves that the need to continue executing a statement or sequence of statements as long as some condition remains true.
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 .
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