我才明白

only then did I understand

→ 我
phrase Rare #21,283
only then did I understand 才 emphasizes that the understanding came later than expected or only at a particular point.
CH: 听完他的解释,我才明白这件事。
EN: Only after hearing his explanation did I understand the matter.

莉娜非得反复提醒,我才明白过来。

It took Lina reminding me over and over before I finally understood.

最后当你的名字出现时,我才明白。

It was only when your name appeared at the end that I understood.

— 隐藏摄像机 (2005)

那时候我才明白你打算用什么料补呢

Only then did I understand what material you planned to use to mend it.

— 唐人街探案 (2015)

晚了一天,我才明白贝尔波特那些人说的话。

It wasn't until a day later that I understood what those people in Bellport had said.

直到我自己有了孩子我才明白了什么是母爱。

It wasn't until I had children of my own that I understood what a mother's love is.

后来我才明白那最后几句话的意思

It was only later that I understood what those final few words meant.

— 烈日灼人 (1994)