These three commands have equivalent effect. The first specifies that the first key's start position ignores leading blanks and the second key is sorted numerically.
帮助文档对这个例子的解释明确告诉咱们：这三个命令是等价的，第一个指定域忽略前导空白，第二个指定域按数值排序；
The rest of the expression is used to see if the value (without leading or trailing blanks) is an empty string.
表达式的其余部分用来检查值(去掉头尾的空格之后)是否是空字符串。
Therefore, it emphasizes the art of blanks in structure by using limited literal expression to leave readers space for imagination and association, thus leading them to recreation.
因此，它在结构上讲究“空白的艺术” ，通过有限的字面上的表达，给读者留下想像、联想的空间，引领读者参与“再创造”。
Therefore, it emphasizes the art of blanks in structure by using limited literal expression to leave readers space for imagination and association, thus leading them to recreation.
因此，它在结构上讲究“空白的艺术” ，通过有限的字面上的表达，给读者留下想像、联想的空间，引领读者参与“再创造”。
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