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The first is that a superstructure of substring and concatenation nodes must be traversed to reach a specified character.
第一个开销就是必须遍历子串和连接节点的上层结构（superstructure）才能到达指定的字符。
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Both wide and non-wide character strings were specified for concatenation.
为串联同时指定了宽字符字符串和非宽字符字符串。
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