• 确切的时间

Exacto爱山吐牌手表exactadj.精密严谨的；确切的Exact additive category正合加法范畴exact periodic solution周期解exact homology sequence正合同调序列exact confidence region严格置信区间exact periodic solutions精确周期解exact penalty functionmc精确罚函数exact statistical method精确统计法exacting and tiring work既要求严格又费力的工作exact testing hypotheses确切检定假设exact in every particularvi.正确到毫厘不差

1. The user has to judge the exact moment to stop.
   用户不得不推断出停止的准确时间。
2. You know the exact time the vending machines are refilled.
   你知道自动贩卖机更换货物的准确时间。