Crying as an expression of feeling is unique to humans and has played an essential role in human evolution and the development of human cultures.

哭泣作为一种情感的表达是人类独有的，这在人类进化和人类文化的发展中发挥了重要的作用。

youdao

But crying as an expression of feeling is unique to humans and has played an essential role in human evolution and the development of human cultures.

但哭泣作为一种情感的表达是人类独有的，这在人类进化和人类文化的发展中发挥了重要的作用。

youdao

youdao

In humans the vocal tract acts as a filter on the sound from the source, and the "source-filter theory" held that the separate, fine control of the vocal tract to be the product of a long evolution in the development of the subtleties of speech.

BBC: Helium-huffing gibbons 'sing with soprano technique'

Case studies, historic maps, photographs, newspapers, government documents, and original objects are used to explore the evolution and development of the once rural island through the centuries, beginning with its early Dutch days.

FORBES: History Buff Alert! Staten Island And Dutch New York

So how does this thinking apply to the continual evolution of the talent that drives that development.

FORBES: Applying Lean Startup Thinking To Managing Talent