If you study English very hard and practise it constantly, you will be able to use it freely.
如果你努力学习英语，并经常练习不断实践，你就能应用自如。
E. g. If you study English very hard and practice it constantly, you will be able to use it freely.
只要努力学习英语，并经常练习不断实践(…)，就能应用(…)自如。
I quite believe in you, for I know you are very accomplished, because you study hard.
我对您十分信赖，因为我知道您造诣很深，您学习又那么用功。
If you are not feeling frustrated and stupid in your Ph. D study, you are not trying hard enough, and are, by the very nature of good research, failing.
如果你在读博士期间，你没有感觉到沮丧或者愚蠢，那么你肯定不够努力，并且从好科研的本质来讲，是很失败的。
Once again, I am really very grateful to you, I will study hard, I wont let you down!
让我再一次说，我真的很感谢你，我会好好学习，我不会令你失望！
If you don't want to fail the final exam, your best bet is to work on your study very hard.
如果你不如果你不想考不过期末考试，你最好开始努力学习。
For the brothers and sisters in ninth grade, recruit exam is not very distant, facing life's first choice, you should redouble our efforts, study hard, make adequate preparations to meet recruit exam;
对于九年级的哥哥、姐姐们来说，中招考试已并不遥远，面临着人生的第一次选择，你们应该加倍努力，刻苦学习，为迎接中招考试做充足的准备；
You have to study very hard because only a select few will be admitted to that college.
你得努力学习，只有少数精英才可能进入那所大学。
You have to study very hard because only a select few will be admitted to that college.
你得努力学习，只有少数精英才可能进入那所大学。
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