When the gasket is placed on the block and the head installed, tightening of the head bolts squeezes the soft metal so that the joint is effectively sealed.
当气缸垫装在气缸体上，然后装上气缸盖以后，气缸盖螺栓就压紧软金属垫，这样结合处就完全密封了。
2
The lower end of the connection head shall be tightly sealed flange in transformer insulation sheath.
接线头的下端应当紧密地贴在变压器绝缘护套的密封法兰上。
3
NPR's Debbie Elliott reports oil has been leaking since Tuesday night when a boat struck a sealed well head.