It has been raining heavily in the last few days and mountain torrents may become a danger at any moment. We must be prepared.

连续下了几天大雨，随时有暴发山洪的危险，要做好准备。

《新英汉大辞典》

We must be prepared against SARS.

我必须做抵抗“非典”的准备。

youdao

We must be prepared against possible natural disasters.

我们必须准备应付可能发生的自然灾害。

youdao

We must be prepared to change the minds of our people and educate them to understand where do we want to take this country to, not through violence."

VOA: standard.2010.04.04

"We are prepared to put more troops into Afghanistan, there must be burden-sharing among the alliance,".

VOA: standard.2009.11.13

Wherever dangers appear, we must be prepared to meet them with clarity and resolve.

CNN: Thompson's November 13, 2007, speech to The Citadel

Just like past generations did, we must be prepared to answer these questions in our time.

WHITEHOUSE: Education, Innovation & The Economy

We must be prepared for difficult hours and days ahead as we learn about the scope of the tragedy.

WHITEHOUSE: President Obama Pledges Support for Haiti