gasket
/ˈgæskɪt; `ɡæskɪt/ n
soft flat sheet or ring of rubber, card, etc used to seal a joint between metal surfaces to prevent steam, gas, etc from escaping 垫圈; 密封垫
The engine had blown a gasket, ie the gasket had suddenly let steam, etc escape. 发动机的一个垫圈失效了（蒸气等逸出）.