expansion pad cap

例句：

1. 1. The expansionpad cap is a crucial component of theengine's cooling system.
   扩张垫片帽是发动机冷却系统的关键部件。
2. 2. The engineercarefully fitted the expansion pad cap to ensureproper functioning.
   工程师仔细安装扩张垫片帽，确保正常工作。
3. 3. During theexpansion process, the expansionpad cap expands and fills the gap between the engine blockand the cylinder head.
   在膨胀过程中，扩张垫片帽会膨胀并填满发动机缸体与气缸头之间的间隙。