Definition
To be unable to comprehend or understand something.
无法理解
I just can't get my head around why he made such a decision.
我就是无法理解他为什么会做出这样的决定。
I can't get my head around this complex theory at all.
我完全无法理解这个复杂的理论。
She can't get her head around the concept of calculus in math.
她无法理解数学中的微积分概念。