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.
辞典例句
Also , this is why changing menus dynamically sometimes backfires.
这就是为什么动态地改变菜单有时候事与愿违.
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My old car backfires all the time.
我那辆旧车老是回火.
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Done carelessly , it backfires and leaves a bad impression of him or her on the audience.
评论者一不留心就会事与愿违,给其他听众留下坏印象.
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