There first appeared a type of object that remained characteristic for Mesopotamia throughout its entire history: the cylinder seal.

那里首先出现了一种东西，它在美索不达米亚的整个历史中一直保持着它的特点：滚筒印章。

youdao

You have to mix oil into the gas in a two-stroke engine because the holes in the cylinder wall prevent the use of rings to seal the combustion chamber.

在二冲程发动机中你必须混和燃料和气体，因为气缸壁上的孔阻止使用活塞环密封燃烧室。

youdao

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

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。

youdao