这对掌握基本词汇必不可少，尤其是发音。

This is essential for developing your basic vocabulary and, more importantly, your pronunciation.

基本词汇-清楚每一个字的基本名单。

The Basic Words - makes clear every word in Basic list.

一种语言的基本词汇即必须掌握的词语。

The basic vocabulary of a language is those words that must be learnt.