Before Top Dad Center

• 上死点前

Before Top Dad Center的用法和样例：

例句

1. You need to clean off your plate before dessert.
   上甜点前你必须吃光你盘子里的东西。
2. The spark is therefore timed to occur before the piston reaches top dead center, otherwise maximum pressure would not be reached in time.
   因而，在活塞到达上死点前，火花便会发生，否则就不可能适时达到最高的压力。