在索引 X 处发现无前置高代理项的低代理项字符。输入可能不在此编码内,或者可能不包含有效的 Unicode (UTF-16)字符。
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English version
Found a low surrogate char without a preceding high surrogate at index: X. The input may not be in this encoding, or may not contain valid Unicode (UTF-16) characters.