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1.The car's exhaust system needs to be cleaned regularly to prevent the discharge cover from becoming clogged.
汽车的排气系统需要定期清理，以防止排气罩堵塞。
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2.The engineer replaced the old discharge cover with a new one, which improved the efficiency of the engine.
工程师用一个新的排气罩替换了旧的，提高了发动机的效率。
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3. The technician carefully removed the old discharge cover and inspected the engine for any signs of damage.
技术人员仔细地移除了旧的排气罩，检查了引擎是否有损坏的迹象。