Install upper barrel, fixed by break flange and bolt nut.

安装上体，用断开法兰和螺栓螺母固定。

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Install new lower barrel, place new snap ring and new flange on the new lower barrel, fixed by bolt nut.

安装新埋管，把新卡环和新法兰套进新埋管里，用螺栓螺母与法兰固定。

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A bigger bolt nut must match the larger, which means that larger diameter bolts need to create conditions on the tight nut.

而更大的螺栓就要匹配更大的螺母，这就意味着需要直径更大的螺栓为上紧螺母创造条件。

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"There's a nut on the inside of the oil pan. The bolt came out. But the nut was not welded corectly to the oil pan,so the nut fell off.

VOA: standard.2010.08.01

Those who had worked on Apollo - who intimately knew every nut and bolt - were left gasping at what they'd accomplished.

BBC: The magic of Apollo

"He was one of these people who had ideas and he had this sudden idea that it would be educationally rather good to put together a geometric system whereby you could nut and bolt things together, " he said.

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