seal off什么意思

seal off的音标：seal off的英式发音音标为：[si:l ɔf]seal off的美式发音音标为：[sil ɔf]...

The city should seal off those tunnels.这个城市应该封闭那些隧道.The enemy made a desperate attempt to seal off the gap through which we had burst.敌人拼命想堵住我们已经冲开的那个突破口.Improved injector nozzles seal off better to keep the process leak...