Assessing productive vocabulary is an important dimension of vocabularyacquisition research.
产出性词汇评估是词汇习得研究的一个重要方面。
2
Vocabularyacquisition is an important part of SLA, which is a step-by-step process, affected by many factors.
词汇习得是语言习得的一项重要内容，它是一个由浅及深的过程，有着丰富的内容，并受各种因素的影响。
3
Since vocabularyacquisition is an indispensable part in language acquisition, it is undoubtedly necessary for us to make efforts on studying how individual words are acquired by EFL learners.