一定要的英文：
must

参考例句：

We must completely change the current status of overstaffed organizations and superfluous staff.
我们一定要彻底改变这种机构臃肿、人浮于事的现况。

Your prescription is ready. Be sure to take them after meals.
你的药配好了。一定要饭后服用。

One main idea possessed her; she must get away from home.
她只有一个想法;她一定要离家出走。

In order to oppose imperialist aggression,we must build a powerful navy.
为了反帝国主义侵略，我们一定要建立强大的海军。

I really dont see why you should keep a diary at all
我真不明白你为什么一定要保留一本日记。

She exacted an apology from the tradesman for having questioned her honesty.
她一定要那个商人向她道歉，因为他怀疑她偷东西。

Always proofread completed letters very carefully.Consult dictionary when necessary or in doubt.
完成的书信一定要很小心地校对，有必要或怀疑时查典。

We must build a centralized, unified Party and make a clean sweep of all unprincipled factional struggles
我们一定要建设一个集中的统一的党，一切无原则的派别斗争，都要清

Set aside a day for the mustsee spectacle of Milford Sound in the heart of NZs unspoiled and aweinspiring fjordland
一定要留一天给不能错过的美景米尔福德峡湾,它位于新西兰腹地纯自然而壮观的峡湾地区。

Make sure you get there in time.
一定要准时到达那里。

must是什么意思：
v. 必须，必然要
n. 必须做的事，必不可少的事物
adj. 不可或缺的，必须的

We must act, we must act quickly.
我们必须行动，立即行动。

You must synthesise various opinions.
你必须综合各方面的意见。

You must not relax your efforts.
你不可以松懈你的努力。

You must keep calm in an emergency.
在紧急关头要保持镇静。

You must give way to betters.
你必须让长者先行。