you are right on the button

那天我说了两个句子，然后问我朋对不对结果她说 you are right on the button 我问为何用button,她说来自加拿大人打冰壶运动。中文的对应我不会，请教各位。

Idiom:

 

on the button

exactly right; in exactly the right place; at exactly the right time. That's it! You're right on the button. He got here at one o'clock on the button.

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