An airplane flew across the sky trailing white vapor.

一架飞机从空中飞过，尾部拖着一条水汽形成的白线。

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Removes leading and trailing white space from a String object instance.

对象实例移除前导空白字符和尾随空白字符。

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Removes leading and trailing white space from a String object instance.

对象实例移除前导空白字符和尾随空白字符。

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