他们拧紧螺栓并进行连接，这样氨就可以流入到舱内。
They tightened bolts and made connections so ammonia could flow into the module.
水浸电机应打开灌水螺栓，灌满洁净的清水后拧紧螺栓，再潜入水中。
Flooding irrigation motor bolts should be open, filled with clean water after the bolt tightening, and then dive into the water.
使用钳子或管扳手拧紧螺栓或螺帽。这样可能会刮伤螺栓头或螺帽，从而形成尖锐的边缘。
Using pliers or a pipe wrench to tighten a bolt or nut. This may scar the bolt head or nut creating a sharp edge.
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