What this means is that music functions can actually improve speech functions and vice versa.

这就意味着，音乐功能的确能提高语言功能，反之亦然。

Traditionally, speech functions were thought to exist in the left hemisphere of the brain while music functions existed in the right hemisphere.

传统上，语言的功能被认为存在于左大脑，而音乐功能存在于右大脑。