另外，也尝试研究了被试们的词汇深度知识。

Moreover, the study also made an attempt to explore the subjects in-depth vocabulary knowledge.

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词汇深度知识包括很多方面，其中，搭配是最重要的一个方面。

Collocation knowledge is the most important part of in-depth vocabulary knowledge.

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接受性词汇量、产出性词汇量与词汇深度知识在不同的学习阶段均有显著相关。

Correlation relationship is found to exist among receptive vocabulary, productive vocabulary and depth of vocabulary knowledge.

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