How men first learnt to invent words is unknown; in other words, the origin of language is a mystery.
人们最初是如何发明单词的不得而知，换句话说，语言的起源是个秘密。
How men first learned to invent words is unknown, in other words, the origin of language is a mystery.
人们最初如何发明了词语还不为人知，也就是说，语言的起源还是个秘。
How men first learned to invent words is unknown, in other words, the origin of language is a mystery.
人们最初如何发明了词语还不为人知，也就是说，语言的起源还是个秘。
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