The base case is whenever S1 or S2 is a zero-length string.

（基线条件（basecase）是S1或S2为长度为零的字符串的情形。

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However, the.net client de-serializes it into a zero length string instead of a null string.

然而，. NET客户端将其反序列化成长度为0的字符串而不是空的字符串。

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The string can be zero in length.

该字符串的长度可以是零。

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The string can be zero in length.

该字符串的长度可以是零。

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