The character alpha is replaced by the replacement character (0x1A); that is information (data) has been lost during the export.

字符 alpha 被替换为替换字符（0x1A）；在导出过程中信息（数据）就丢失了。

youdao

Since the code page 1252 contains only a subset of all Unicode characters, those Unicode characters that have no equivalent in code page 1252 are replaced by a so-called replacement character.

因为编码页1252只包含所有unicode字符的一个子集，在编码页1252中没有对应编码的那些Unicode字符由一个所谓的替换字符来替代。

youdao

A best-fit fallback handler, which replaces bytes that cannot be decoded with some suitable replacement character.

最佳回退处理程序，它把无法解码的字节替换为合适的替换字符。

youdao