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TOEFL IELTS BNC: 4259 COCA: 4021
seal¹
/si:l ||; sil/noun[C]
1 a grey animal with short fur that lives in and near the sea and that eats fish. Seals have no legs and swim with the help of short flat arms(flippers). 海豹
2 an official design or mark that is put on a document, an envelope, etc to show that it is genuine or that it has not been opened 封蜡；火漆
3 a small piece of paper, metal, plastic, etc on a packet, bottle, etc that you must break before you can open it 封口；封条
4 something that stops air or liquid from getting in or out of something 封塞；封口: The seal has worn and oil is escaping. 封口破损了，油正往外渗漏。
seal²
/si:l ||; sil/verb[T]
1 seal sth (up/down) to close or fasten a package, envelope, etc 封；封装: The parcel was sealed with tape. 那个包裹已用胶带封好了。 to seal (down) an envelope 给信封封口
2 seal sth (up) to fill a hole or cover sth so that air or liquid does not get in or out 封闭；密封: The food is packed in sealed bags to keep it fresh. 食物装在密封的袋子里以保鲜。
3 (formal 正式) to make sth sure, so that it cannot be changed or argued about 保证；确认: to seal an agreement 签署一项协议
seal sth off to stop any person or thing from entering or leaving an area or building 封锁；封闭: The building was sealed off by the police. 警方封锁了大厦。
TOEFL IELTS BNC: 4259 COCA: 4021
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。
seal2 v [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。
TOEFL IELTS BNC: 4259 COCA: 4021
seal sealseals1 nounan animal with short fur that lives in and near the sea, and that eats fish
seal sealsealssealedsealing2 verb (seals, sealing, sealed )to close something tightly by sticking two parts together: She sealed the envelope.

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