If the engine backfires , the sudden pressure in the intake manifold forces the valve back.如果发动机回火, 进气歧管骤增的压力就迫使阀门向后移动.I heard, even over the babble of the crowd, a sharp, shocked intake of breath.即便人声鼎沸,我还是听到有人猛地倒抽一口冷气。...
...the heats of the men's 100m breaststroke.男子100米蛙泳预赛Such illegalities may occur in breaststroke and underwater defining that may exceed allowable lengths.类似的犯规行为可能出现在蛙泳比赛中,或者运动员在水下的动作超过了规定的要求.New Breaststroke is a...