"on the button" in Chinese (Simplified)
正好准确无误
Definition
“On the button” 表示完全正确，或是正好在确切的时间或数值上。常用于某事完全符合目标时。
Usage Notes (Chinese (Simplified))
属于英式和澳大利亚口语，表示精准或时间点准确。常见于数字、时间或判断非常正确时。不要与“on the spot”（当场、立刻）混淆。常见于体育及日常对话中。
Examples
The train arrived on the button at 8:00.
火车**正好**八点到达。
Your answer was on the button.
你的答案**完全正确**。
She finished the test on the button in one hour.
她**正好**一小时完成了考试。
Wow, that guess was on the button!
哇，这猜测**正好**对了！
They scored on the button to win the game.
他们**正好**得分赢得了比赛。
His prediction was on the button—the temperature hit exactly 25°C.
他的预测**正好**，温度正好到25°C。