后来，当我学习机械工程时，所有学科的教材都是英文的。
Later, while studying Mechanical Engineering, the books of all our subjects were in English.
我当年学英语，我没有想到后来英文帮了我的大忙。
I had to learn English, I did not expect this later helped me a lot in English.
起初他的英文不是很好。后来，他通过练习就进步了。
Initially, his English was not very good. Later, it improved with practice.
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