BTDC Before Top Dead Center
英
美
- 在上止点前
双语例句
- The clock began to whirr before striking the hour.
钟在打点前先嘎啦嘎啦地响起来。 - 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。
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