R语言中 字符串拆分时候用“.”怎么拆分

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当我这么拆分为什么显示

strsplit("From the hell to the heaven,There's no straight way to walk.Sometimes
up, sometimes down.Hope creates a heaven for us,Despair makes a hell for us.
",".")

为什么会这样
[[1]]
  [1] "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""
[62] "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""
[123] "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""

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关键词：R语言 字符串 Sometimes straight creates