词汇的质，即词汇深度，也就是学习者所掌握的词汇各方面的知识。
The latter, depth of vocabulary knowledge, is defined as a learners level of knowledge of various aspects of a given word.
接受性词汇量、产出性词汇量与词汇深度知识在四个学习阶段均有不同程度的显著相关。
Receptive vocabulary size, productive vocabulary size, and depth of vocabulary knowledge correlated with each other significantly at the four different learning stages.
然而，词汇搭配作为词汇深度知识的一个方面，在第二语言的词汇教学中却没有引起足够的重视。
However, lexical collocation, one aspect of the depth of vocabulary knowledge, has been neglected in second language vocabulary teaching.
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