Can a Good Listener Help Me Translate? I am translating a paragraph from English into Chinese, going by a recording a native speaker made. I am trying to use the same characters that they are using in their spoken translation, but am having difficulty with one passage. The passage's English source material is the following:

"A major goal of language learning is to acquire the ability to communicate in that language."

I've attached a link to the speaker's recording. The passage above begins at about 54 seconds in, with the passage I'm having trouble with beginning at about 57 seconds (at "就是...") and ends at about 1:05 (at "为了..."

https://vocaroo.com/i/s1egf4TlxINm

I can't seem to find the exact characters the speaker uses. 
Any help is greatly appreciated!
就是掌握用那种语言去交流的能力

The speaker's pronunciation is not perfect. The pronunciation of "那" (the intended pronunciation should be nei4 here) is not good.

那 is often pronounced as nei4 in speech.