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。
The region is called the blind spot. 这个区域叫做盲点。
The power of this paralysing sense of fear has driven some to a blind spot where they cannot see matters in perspective. 这种杯弓蛇影的慑骇力，却把人类美好的信念，无情地推向一个错误的盲点。
