Recognizing the character as a single, unit as opposed to a sequence of bytes, is a requirement in the case of string manipulations involving multi-byte characters.
将字符看作一个单元而不是一个字节序列，这是进行多字节字符的字符串操作的必要条件。
If a character in a particular encoding spans multiple bytes, the character-based string functions can process each character as a single unit as opposed to a sequence of bytes.
如果采用特殊编码的某个字符的长度跨越了多个字节，则基于字符的字符串函数可以将每个字符处理为一个单元而不是一个字节序列。
A collating element is any single character, or any sequence of characters that collates as a single unit.
对照元素是任意的单个字符，或对应于某个单个单元的字符序列。
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