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