Put the top in place and tighten the bolt.
投入这个顶面到位和拉紧螺栓。
The plumber take out a wrench and tighten the bolt.
修水管的工人拿出一把扳手拧紧了螺栓。
And the more big bolt will match more nut, which means more need for the bolt diameter to tighten the nut create conditions.
而更大的螺栓就要匹配更大的螺母，这就意味著需要直径更大的螺栓为上紧螺母创造条件。
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