gives us the physical ability to produce a wide variety of sounds.从而赋予我们发出更多不同声音的能力

ability to有 ... 的能力

She has the ability to keep calm in an emergency.

她有处变不惊的本事。

I don't doubt your ability to do the work.

我不怀疑你有能力担任这项工作。

variety of各种的

A variety of food is sold at a supermarket.

超级市场各式各样的食物均有出售。

A great variety of flowers were shown in the park.

公园里展出了很多品种的花。

leaving them incapable of making the complicated sounds of speech这使得它们无法在自己的短声道中

incapable of 无能力的(不能的)

A child is considered legally incapable of committ a crime.

一个孩子在法律上是被看作无能力犯罪的。

His honesty made him incapable of lying.

他的诚实使他不能撒谎。