It's necessary for us to study hard .

我们必须努力。

Each boy and each girl works hard.

每个生都努力。

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

你必须努力, , 英语考试会及格。

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

失业威胁促使生更加努力。

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

你努力, 因而没有好分数。

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

你成为一个仅仅靠努力而得到高分医院生吗？

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.

你们担心我我知道,我会努力会让你们失望.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.

大新生需要很长时间就能适应牛津生活方式----努力，尽情娱乐，同样舒适黑色领带，暗色系（正式位服）或者奇装异服。