I worry about her constantly.

我一直在为她担心。

《柯林斯英汉双解大词典》

We have less to worry about now.

现在我们要担忧的事少一些了。

《牛津词典》

Don't worry about the cost—I'll treat you.

别担心费用，我来替你付。

《牛津词典》

The depression ended. The economic depression of the eighteen nineties forced Americans to worry first about developments at home.

VOA: special.2010.07.01

In other words, if we don't have to worry about entropy or volume equilibrium is achieved when energy is at a minimum.

换句话说，如果我们不担心熵,和体积的平衡,那么能量就得是最小的。

麻省理工公开课 - 热力学与动力学课程节选

So you don't have to go to work and worry about waking up early tomorrow.

所以你不用上班，也不用担心第二天一早得爬起来上班。

I'd like 实战 - SpeakingMax英语口语达人

Congress is afraid of their boss. (We, the people.) They worry about getting fired.

FORBES: Congress Motivated By Fear, Incompetence... Just Like Big Business!

U.S. stock indexes were slightly higher and European stocks were narrowly mixed as investors continue to worry about the U.S. fiscal cliff negotiations that appear to have again stalled, after some movement toward an agreement was apparent earlier in the week.

FORBES: P.M. Kitco Metals Roundup: Gold Ends Sharply Lower amid Improving U.S. Economic Data, More Technical Selling

With President Obama in the White House, does Mr. Ma ever worry about the U.S. commitment to security in the Asia-Pacific region?

WSJ: Interview with Ma Ying-jeou: Taiwan's D��tente Gamble