1、
2、
It returns the number of bytes that were not clearable or zero if the operation was successful.
它将返回不可清除的字节数，如果操作成功，则返回0。
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3、
Asian languages, including Hindi, Japanese, and Chinese, require three bytes per character.
对于亚洲语言，包括北印度语、日语和汉语，每个字符需要3个字节。
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4、
