登月舱降落部分和起飞部分的燃料和氧化剂罐都被加大，降落部分的底部的钟形喷管（engine bell）也被加长。登月舱上还增加了普通电池和太阳能电池板以增加电力。
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fire engine bell 救火车铃
bell crank engine 钟形曲柄发动机
Above the noise of driving rain came the sound of the engine bell.
机车的铃声透过急促的雨声传了过来。
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Just after Discovery's engines fired, launch controllers noticed a small rectangular object drop from the bottom of the ship, carom off an engine bell and vanish into the exhaust flames.
CNN: Victory Lap
Its three fire ponds had been filled in, the local fire engine had disappeared and even the village fire alarm bell had been removed, he wrote.
BBC: Russian PM Vladimir Putin answers angry fires blogger
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