1、
All names in a qualified name other than the rightmost, which is called the simple name.
限定名中除最后右边那个简单名之外的全部名字.
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2、
3、
Extracts a specified number of characters from a text item, starting with the rightmost character.
从文本项中提取指定数量的字符(从最右边的字符开始).
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