我们必须把各种潜在危险告诉他们。
他们采用了新的制度，所有的雇员都必须定期进行培训。
They have introduced a new system whereby all employees must undergo regular training.
他们必须要遵守规定。
为了利用这一先进技术他们必须对计算机有基本的了解。
They have to have a basic understanding of computers in order to use the advanced technology.
狗必须被隔离6个月后他们才会放它们进来。
Dogs have to be quarantined for six months before they'll let them in.
他们告诉雅克·得洛斯，必须不惜一切代价避免灾难性的世界贸易大战。
They told Jacques Delors a disastrous world trade war must be avoided at all costs.
他们这周必须回到学院注册，并制定出新学期的课程表。
They had to be back at their colleges this week to enrol and work out class schedules for the new term.
特技演员必须和他们所替身的明星长相相似。
他们必须承诺与年长的邻居共度时光。
They must commit to spending time with their older neighbours.
他们必须得到一个要么是要么非的明确回答。
奇怪的是，顾客似乎也忘记了他们必须支付他们购买的杂货的钱。
Strange is that seems customers also seem to forget that they have to pay for their groceries.
他们必须参加俱乐部活动。
我们余下的人必须躲开他们，不然只能静静站着等待一场不可避免的碰撞。
The rest of us have to evade them or just stand still to wait for the unavoidable collision.
他们必须提出问题，而这些问题又将引出其他问题。
They have to ask questions and these questions lead to other questions.
首先，他们必须搞清楚火星上是否曾经存在过生命。
To begin with, they will have to find out whether life has ever existed on the planet of Mars in the past.
广告商必须调整他们的方法来接触这些受众，同时也必须调整他们的劝说策略来适应网络媒体。
Advertisers will have to adjust their methods to reach these audiences and will have to adapt their persuasive strategies to the online medium as well.
他们会好起来的，因为我们必须开始让他们成为他们现在应该成为的样子。
They'd get better, because we would have to start making them what they ought to be right now.
例如，他们必须确保他们制定的措施对每一个被研究的文化或少数民族群体都是有意义的。
For example, they must make sure they construct measures that are meaningful for each of the cultural or ethnic minority groups being studied.
他们必须对这些孩子采取点行动，因为很明显他们的行为已经出轨了。
They've got to do something about these children because clearly they've gone off the rails.
这一举动是给为他所害者的朋友们的一个信号，告诉他们他是个必须被小心对付的人。
This act was a signal to his victim's friends that he was someone to be reckoned with.
他们必须区分大写和小写的单词，或者更难的是，他们必须数出不同单词的音节数。
They have to distinguish between words in upper and lower-case letters or even harder, they had to count the number of syllables in different words.
青少年对他们自己的行为负责，必须教育他们如何成为一个好公民。
Teenagers are responsible for their own actions and must be taught how to be a good citizen.
我们必须拯救他们。
他必须照顾他们。
我们青少年必须远离他们。
他们必须工作赚钱养家。
他们必须做出许多改变。
他们必须时刻注意它们，这样他们就不会忘记它们。
They had to pay attention to them all the time, so they didn't forget them.
因此，他们必须确保时机准确。
他们必须用干净的水洗脸。
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