seal1/sil; siːl/n [C] 1 a large sea animal that eats fish and lives by the sea in cold areas 海豹2 a piece of paper or plastic that you break to open a container〔容器的〕封条: Do not use this product if the seal on the bottle is broken. 如瓶口封条破损﹐请勿使用本品。3 a mark that has a special design and is put on documents to show that they are legal or official 印章﹐印鉴﹔图章: The letter had the seal of the Department of Justice at the top. 这封信的上方盖有司法部印章。4 a piece of rubber or plastic that keeps air or water out of something or inside something 密封条﹐密封纸: One of the seals was broken and oil was leaking out. 有一处密封条破损﹐油漏了出来。
seal2v [T] 1 also 又作 seal up to close something very firmly so that people or things cannot get in or out 把…密封住﹐封闭: The windows were sealed shut. 窗户被封起来了。2 to close an envelope and fasten the edges in place 封住﹐粘住〔信封〕: He sealed the envelope and handed it to me. 他把信封封好交给我。 3 seal a deal/agreement etc to make an agreement definite and official 达成交易/协议等 —sealed adj : a sealed envelope 封好的信封seal sth in phr v to stop something that is inside something else from getting out 密藏﹐把…封住: Fry the meat quickly to seal in the flavour. 把肉很快地煎一下以保持味道。 seal sth off phr v to stop people entering an area or building, because it is dangerous〔因危险〕封锁〔区域或建筑〕: Police have sealed off the city centre. 警方已封锁了市中心。