从以下词典查找：
历史：
高考 CET-4 CET-6 考研 TOEFL IELTS BNC: 4259 COCA: 4021
seal noun | verb
 1 
seal / sil ; si:l /noun C
1. a large sea animal that eats fish and lives around coasts海豹
⇒picture atFOOD CHAIN
2.
a. a mark that has a special design and shows the legal or official authority of a person or organization印记，图记:
•The document carried the seal of the governor's office.文件上盖有州长办公室的图章。
b. the object that is used to make this mark印章，图章
3. a piece of rubber or plastic that keeps air, water, dirt etc out of something〔防止空气、水、灰尘等渗入的〕密封条，密封纸:
airtight / watertight seal
•an airtight seal around the windows窗户四周的密封条
4. a piece of WAX , paper, wire etc that you have to break in order to open a container, document etc封蜡，封条，火漆
5. seal of approval if you give something your seal of approval, you say that you approve of it, especially officially正式认可，正式批准:
•A number of employers have already given their seal of approval to the scheme.一些雇主已经对这项计划表示认可。
6. set the seal on sth BrEto make something definite or complete确定某事，使某事成定局:
•In 1972, Nixon himself went to China to set the seal on the new relationship.1972 年尼克松亲自访华以确立新的外交关系。
 2 
sealverb T
1. also seal up to close an entrance or a container with something that stops air, water etc from coming in or out of it〔为防止空气、水等渗入或渗出〕把…封住，封闭:
•The window was sealed shut.这扇窗户被封了起来。
seal a joint / crack / opening / gap
•A quick way to seal awkward gaps is to use a foam filler.封闭难弄的裂缝的快捷办法就是用泡沫填充剂。
•Dried milk is kept in hermetically sealed (=very tightly closed) containers.奶粉储藏在完全密封的容器里。
2. if a building, area, or country is sealed, no one can enter or leave it封闭，封锁〔建筑物、地区、国家〕:
•Authorities plan to seal the border.当局计划要封锁边境。
3. to close an envelope, package etc by using something sticky to hold its edges in place粘住，封住〔信封、包裹等〕:
•He wrote the address and sealed the envelope.他写好地址，封上信封。
4. to cover the surface of something with something that will protect it封盖…的表面:
•Wooden decks should be sealed to prevent cracking.木板平台应该刷防护漆防止开裂。
5. seal sb's fate to make something, especially something bad, sure to happen决定某人的命运〔尤指厄运〕:
•The outbreak of war sealed the government's fate.战争的爆发决定了政府的命运。
6. seal a deal / bargain / pact etc to make an agreement more formal or definite达成协议/交易/协定等
7. seal a victory / win / match to make a victory certain锁定胜局:
•Smith's goal sealed the victory.史密斯的入球锁定了胜局。
⇒my lips are sealedmy lips are sealed at LIP(5)
⇒all signed and sealed at SIGN² (6)
 PHRASAL VERBS 
seal sth ↔ in
to stop something that is inside something else from getting out密藏〔某物〕，将〔某物〕封住:
•Fry the meat quickly to seal in the juices.把肉快煎一下锁住肉汁。
seal sth ↔ off
to stop people from entering an area or building, because it is dangerous〔因有危险而〕封闭，封锁〔某地区或某幢建筑〕:
•Following a bomb warning, police have sealed off the whole area.接到有炸弹的警告后，警方封锁了整个地区。

© Copyright 2018