但是，目前为止，还没有任何一个教学法或语言学理论能培养二语学习者达到理想的外语水平。
However, so far no single teaching method or linguistic theory can lead learners to attain such an ideal language proficiency as that of a native speaker of the target language.
其次，随着语言水平的提高二语学习者趋向于运用复杂的词汇。
Practically, findings in this study have important implications for the research in the field of quantitative description of learners'productive lexical command.
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