"When you have a situation like this occur, you are bound to have a situation down the line where there could be a shortage in food, which can also trigger other negative situations, such as malnutrition, for example, or insufficient food for cattle, which is also another important economic sector in West Africa,".

VOA: standard.2009.09.08

When I think about this situation, an analogy always occurs to me.

每当我想到这种情境时,总会联想到一个类比

耶鲁公开课 - 死亡课程节选

You often use this when you're expressing how you feel about a situation,

当你想表达对某一情况的看法时，你会常常用到这个句型。

It seems 课堂 - SpeakingMax英语口语达人

I've got to find them by experimenting, by putting other bodies and seeing how they react and then finding out what's the force that acts on a body when it's placed in this or that situation.

我得通过实验找出这些力,我会增加其它物体,观察其反应,求出当它处在这种或者那种情况下时,作用在物体上的力

耶鲁公开课 - 基础物理课程节选

When you‘re discussing your situation with a friend, you could tell them that you were doing this by using the "I'm ~ing" pattern.

当你跟一个朋友谈起你的情况时，你可以用“I'm ~ing”句型告诉他们你在做什么。

I'm ~ing 课堂 - SpeakingMax英语口语达人