如果前导字符长度太长，与整个区域明显不适应，那么它将会令起一行。
If the leader's length is too long to fit in the area, the leader will begin a new line.
对象实例移除前导空白字符和尾随空白字符。
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。
Removes leading and trailing white space from a String object instance.
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