situations
You use situation to refer generally to what is happening in a particular place at a particular time, or to refer to what is happening to you.
circumstances
Army officers said the situation was under control.
军方官员说局势已得到控制。
And now for a look at the travel situation in the rest of the country.
现在来看一看该国其他地区的旅行条件。
The local authority faced a difficult financial situation.
地方当局面临严峻的财政形势。
If you want to improve your situation you must adopt a positive mental attitude.
如果想改善处境,你就必须采取积极的心态。