It's necessary for us to study hard .

我们必须学。

Each boy and each girl works hard.

每个学生都学。

You must study harder (or) else you'll fail in the English examination.

你必须学, 然的话, 英语考试会及格的。

The threat of unemployment has spurred students on to work harder at their studies.

失业的威胁促使学生更加学。

You don't study hard, thence no good mark.

你学, 因没有好分数。

Would you want a ducter doctor who get a got high marks in middle medical school just for a trying really, really hard.

你成为一个仅仅靠学到高分的医学院学生吗？

Many days after this examinatorial period I would go home,I do miss you so much,and I know you're worried about my study ,I won't disappoint you.

你们担心我的学我知道,我会学会让你们失望的.就写这些吧.

It doesn't take long for freshers to adopt the Oxford way of life — working and playing hard, and feeling equally comfortable in black tie, subfusc (formal academic dress) or fancy dress.

大学新生需要很长时间就能适应牛津的生活方式----学，尽情娱乐，同样舒适的黑色领带，暗色系的（正式学位服）或者奇装异服。