1.look out 朝外；當心

Do look out for spelling mistakes in your work.
一定要當心你作業中的拼寫錯誤。

He then kept a look out for the restaurants we could dine in for that night.
然后他戀戀不舍的看了看本來那晚我們要去吃飯的餐廳。
2.now and then 有時，時而

Every now and then, however, the intellectuals get itchy feet.
然而，聰明人卻不時在蠢蠢欲動。

Now and then I think of when we were together like when you said you felt so happy you could die.
偶爾會想起我們還在一起的時候像當你說你高興的幾乎要死了。

3.at risk 危險

How much are the big u.s. banks at risk in europe?
這些美國大銀行的歐洲風險有多高？

The escalating legal battle, however, seems to have put that relationship at risk.
不過不斷升級的法律大戰可能會危及兩者的關系。