这个阀门是用在飞机驾驶舱内控制空气温度的。
This is a valve that controls the temperature of the air inside the cabin in an airliner.
飞机下落时，两名副驾驶员和机长都在飞机驾驶舱内。
At the time of the descent, the two co-pilots and captain were in the aircraft cockpit.
他说即便调查人员找到飞机残骸，恢复驾驶舱内的录音，也会证明没什么用。
Even if investigators were to find the wreckage and recover the cockpit voice recorder, it would prove useless, he said.
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