There first appeared a type of object that remained characteristic for Mesopotamia throughout its entire history: the cylinderseal.
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。
2
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。
3
Generally, the cylinder and the cylinder head bolt together with a thin gasket pressed between them to ensure a good seal.