Maybe the languages developed from the same source language long ago, that is, maybe they are genetically related, that was what happened with Sanskrit, Latin and Greek.

也许，这些语言是很久以前从同一种源语言发展而来的；也就是说，也许它们在“基因”上是有联系的，这就是梵语、拉丁语和希腊语的情况。

youdao

Members of the group were born deaf and never learned Spanish or a formal sign language, but they have developed a gesture system to communicate with people around them.

研究人群天生就是聋子，从没有学过西班牙语或其它正式的符号语言，但是他们有一套能让他们与周围人沟通的手语系统。

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This is also the case for the translation test professional, who has mastered the language for which they test and developed a mental list of common problem areas.

对于翻译测试专业人员也是如此，他们掌握了要进行测试的语言并且在脑海里形成了常见问题区域的列表。

youdao

They take this makeshift communication system developed by adults and, again, they turn it into a full-blown language, suggesting that to some extent it's part of our human nature to create languages.

他们继承了成人发展出来的临时交流系统,将这个临时交流系统,再次发展成一种成熟的语言,这表明从某种程度上来说,创造语言是我们人类本性的一部分

耶鲁公开课 - 心理学导论课程节选

Websites have sprung up to cater to the "lolcat community", and members have even developed their own language: an approximation of how cats might sound if they spoke, according to those in the know.

BBC: Lolcat art: Gallery hosts exhibition of cat phenomenon

And though paleoanthropologists are coming around to the view that Neanderthals developed sophisticated ways to communicate, including some form of spoken language, they may have lacked the rich vocabulary or symbolic structure we take for granted today.

WSJ: Neanderthals: Why Us and Not Them?