"This is the same thing as in the Angel's Wing next to Cambodia sanctuary for the enemy, can't go across that line, can't get into that area where the enemy is.

VOA: standard.2009.09.09

Energy can flow across the glass but I put a lid on top, and so the water can't get out.

能量可以穿过杯壁流动,但是我在顶上加了盖子，所以水不能跑出来。

麻省理工公开课 - 热力学与动力学课程节选

You use "I can't help but" when you feel helpless, when you want to get something across that needs to happen.

当你觉得无助时，或者当你说明需要做到这件事情的时候，你就可以使用“I can't help but”句型。

I can't help but 课堂 - SpeakingMax英语口语达人