因此，显然他们的英语词汇量比以英语为母语的人要小得多。
Therefore, by definition, they had a much weaker English vocabulary than native speakers.
英语词汇量很大，用法也很多，所以一个中国人想把英语说的像母语者一样流利并不容易。
English has a large vocabulary with different usages so it's not easy for a Chinese person to speak English as fluently as a native speaker.
人们通常学到中级水平，英语词汇量就会停滞下来。
Very often what happens is that people get to an intermediate level and their English vocabulary plateaus.
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