不要拆下盖子或发动机吊点支架上的铰链螺栓。
Do not remove the cap or the hinge bolt for the engine mount bracket.
科学家说，空间中可能有数以千万计更小的颗粒，不能从地球上识别，比如螺栓、或冻结的发动机冷却剂的小块。
Scientists say there could be tens of millions of smaller particles, such as bolts or chunks of frozen engine coolant, that cannot be discerned from Earth.
锥形螺栓，外形是锥形的螺栓，用以将发动机连接到飞机结构上。
Cone bolt, a bolt in the shape of a cone for engine attachment to the airplane structure.
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