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可以通过增加一个非必需的参数，轻松地改变这个函数的用途。
You can easily repurpose this function by adding a nonrequired argument.
youdao
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横跨历史，旗帜的目的及用途一直在增加。
Throughout history, the purpose and usage of flags have grown.
youdao
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横跨历史，旗帜的目的及用途一直在增加。
Throughout history, the purpose and usage of flags have grown.
youdao