The United States has to be careful it doesn't overplay its hand.

美国得注意不要高估自己。

《柯林斯英汉双解大词典》

I had to be careful not to get a sore throat and lose my voice.

我必须小心，不要患上咽喉炎而哑了嗓子。

《柯林斯英汉双解大词典》

You have to be careful what you say on TV.

在电视上说话时你不得不谨慎。

《柯林斯英汉双解大词典》

So it looks like what is supposed to be a simple enumeration or careful count of the nation's population this year will be anything but routine.

VOA: standard.2010.02.03

So it's a way of reminding you, I've got to be careful about the types of things that I put in.

因此我这是在提醒你，一定要对输入的东西的类型,多加注意。

麻省理工公开课 - 计算机科学及编程导论课程节选

And you don't have to be too careful or fine about gradations of punishment in the state of nature.

而且在自然状态中，你不必,对实施惩罚的程度太过小心。

耶鲁公开课 - 公正课程节选

"You've got to be careful that you don't put your club at risk, and that's the balance we're trying to get at the moment, " he said.

BBC: Mowbray denies cautious spending

"They've got to be careful about dotting the i's and crossing the t's, " Ms. Feddis said.

WSJ: In Lieu of Toasters, Bank Customers Burned

"We've got to be careful that this thing doesn't spread and other guys start dropping so we kept them back at the hotel, " Woodson said.

WSJ: Knicks try to recover from illness, offensive woes