Eng: I understand

我明白了

I get, I see, I understand

Clear, Easy to understand, Realize(s), Understand, Understandable, Understanding, Understands, Understood, Realize, Realized, Understand, Understood

我了解

I understand

Consider, Know, To consider, To know, To understand, Understand

我懂

I understand, I understood

我聽到了

I heard, I know, I understand, I'm listening

Hear, Heard, Listened, Heard, Listened, Arrive at, Get to, Got to, Had arrived, Reach, Reached

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I understand the rationale behind it