1. 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。
2. This paper points out the potential applications of arc-shaped and stepped seal and the possible damage on cylinder seal cause... 本文在深入分析液压缸密封结构的基础上，提出了弧形与阶梯形密封的应用前景和气穴现象对密封的危害及消除方法。
3. Design blue print of the hydraulic cylinder seal style was put forward for the hydraulic cylinder with large power, larger load and long journey. 提出了一种大功率、大负载、长行程工作条件下，液压缸活塞与缸体之间、活塞杆与缸盖之间密封方式的设计方案。
4. From 1993, the reconstruction of low pressure cylinder sealing began to conduct. The floating ring seal are changed into steam jamming seal. The applied effect is good. 1993年开始实施低压缸密封改造，将浮环密封改造成蒸汽阻塞密封，使用效果良好。
5. 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。
