中国是世界上最大的螺丝钉、螺母、螺栓和垫圈生产商，而欧盟是这些商品的最大市场。

China is the world's biggest producer of screws, nuts, bolts and washers, while the EU is its biggest market.

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一般来说，气缸和气缸盖用螺栓紧固在一起，气缸与气缸盖之间用一薄垫圈确保密封良好。

Generally, the cylinder and the cylinder head bolt together with a thin gasket pressed between them to ensure a good seal.

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确证在APU保护罩的右后吊点上安装了螺栓和垫圈。

Make sure the bolt and washer are installed for the right aft mount on the APU shroud.

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