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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.
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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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5、
If it backfires , it could bedevil efforts to contain public spending.
若计划遭遇不测,为控制政府开支所做的努力将功亏一篑.
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