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Read our list of useful expressions to use in life's special and serious situations.
看一看我们列出的实用表达法，可以在生活中的特殊或者严肃的场合派上用场。
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It is useful for teaching regular expressions and state machines.
它有助于讲授正则表达式和状态机。
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It is useful for teaching regular expressions and state machines.
它有助于讲授正则表达式和状态机。
youdao