Learners learn and produce the L2 with varying degrees of accuracy at different stages of development.
The need for grammatical and lexical accuracy is one reason why most L2 learners find academic writing to be the most difficult skill to learn.
英语词典包含67175条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。