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When using them, stick to the format above; that is, keep the "if" and the "then" on separate lines, and keep the "else" and the terminating and required "fi" in horizontal alignment with them.
在使用时，要遵循以上格式；即，将 "if" 和 "then" 放在不同行，并使 "else" 和结束处必需的 "fi" 与它们水平对齐。
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