Listening teaching has always been the most difficult and important part in college English.
听力教学一直是公共英语教学中最困难但也至关重要的一环。
The most important, and still difficult part is to know accurately where we are.
最重要的，而且较困难的是如何确切的知道我们在哪里。
Vocabulary is an important part in language learning. And it is a difficult task.
掌握词汇是英语学习的重要任务，也是不易完成的任务。
Vocabulary is an important part in language learning. And it is a difficult task.
掌握词汇是英语学习的重要任务，也是不易完成的任务。
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