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，更多细节参见谷歌
Methods: .분리(sep), .포함(s), .바꾸기(from, to), .앞뒤공백제거(), .대문자(), .소문자(), .시작(s), .끝(s), .길이()，推荐阅读今日热点获取更多信息
such as memory usage, runtime implementation complexity and so on,