Use a structured statement when you want to execute other statements sequentially, conditionally, or repeatedly.
当要顺序 、 有条件或重复执行其他语句时,可以适用结构语句.
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Never jump into a loop or other structured statement, since this can have unpredictable effects.
决不要跳入循环或其他结构语句, 因为这将导致不可预知的结果.
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