n (1)图(印)章，玺(piece of metal，ring，etc often round，with figure，symbol，word，letter，etc used as evidence of a government，university，company，or (esp，in earlier times) a powerful person)[C]：the great～of the United States美国国玺;the～of the King国王御玺;wear a ring with a～bearing one's mark 戴一枚刻有自己标志的戒指;stamp one's～to a document 在文件上盖印章;press one's～into the hot wax 在热蜡上盖印章;The solicitor stamped the certificate with his～.律师在证书上盖上了印章。

(2)(加盖的)图(印)章(official mark on a document，sometimes made with wax，which shows that it is legal or has been officially approved)[C]：the letters and documents that bear the～of the King 有国王封印的信件和文件;The～of the United States attached to important government papers.美国重要的政府文件都加盖国印。〖同〗mark，symbol;

(3)封条(蜡，铅)，火漆(piece of paper，wax，lead，etc，stamped with some official design fixed to a door，container，or letter，etc)[C]：the～s of a packet/a letter/a drawer包裹上/信件上/抽屉上的封条; tear open (break) the～打开(撕下)封条;the door of the room that is fastened by a metal～ 用金属封条封好的房间门;

(4)密封物(垫)(sth that seals，closes，or fastens tightly so that gas or fluid cannot enter or escape)[C]：an oil～防油封圈;a rubber/gas/water～(橡)胶封圈/防气封圈/防水封圈;a～around a window 窗户四周的密封条;break the～on the jar打开坛子的封口;clean the～of the fridge door regularly定期清洁冰箱门密封条;put a～around the edge of the bath在浴盆周围放上防漏封圈;

(5)密封(tight closure，as against the passing of air or water)[C]：The door doesn't close tight until it has a good～on it.这门密封好，才能关得严。

(6)印花帖签(stamp placed on envelope)[C];

a seal of approval批准，正式认可：giving the drug/the proposal/the deal a～of approval 批准该药上市/采纳建议/协议生效;

set the seal on确保完成某事(fml)：The trip set the～on our friendship. 这次旅行奠定了我们的友谊;The meeting set the～on the negotiations. 这次会议为谈判成功打下基础。

put the seal to 同意，批准：Both the families have put the～to the marriage.双方家庭都答应了这门亲事。

vt(1)盖章(印)(mark with a seal)[T+n]：The treaty/statement was signed and～ed.条约/声明已签署盖印。～the document with the King's insignia 在文件上盖上国王的印玺;〖同〗 certify，confirm，verify，approve;

(2)封住某物(close by any form of fastening(that mustn't be broken before access can be gained))[T+n，T+n+adv (up)]：～the parcel/the bottle (up)封上包裹/封上瓶口;～(up) the letter with sticky tape 用胶带把信封好;Messages from the king used to be～ed with wax. 国王的信件常用蜡封。～ed orders 密封的命令;〖同〗fasten;

(3)粘住(信封等) (fix (as if) with glue or other similar substance)[T+n，T+n+adv(down)]：～an envelope down and put a stamp on it把信封粘上，贴上邮票;I put a plastic cover on my book，but I didn't～it down properly and it came off.我给书套上塑封，可没封住，掉下来了。

(4)将某物密封住(close tightly or put a substance on sth so that gas or fluid cannot enter or escape)[T+n，T+n+adv (up)]：～up a pipe封住管子;～(up) a jar of fruit/a can of food 把装水果的广口瓶/食品罐头密封住;～(up) doors before fumigating 在熏烟消毒前把门都封好;(birds)～(up) the holes (cracks) in the nest with mud(鸟)用泥巴封住巢穴上的孔洞(裂缝);Her lips were～ed by a promise.(fig)她有诺言在先，因而守口如瓶。They tried to～his lips.(fig)他们企图不让他走漏一点风声。

(5)填充(满)，涂盖密封物(fill up or coat with certain substance)[T+n]：～a leaky wall 填补有裂缝的墙体;～the floor with paint/the hull with paint给地板涂上一层漆/给船身涂上一层漆;

(6)解决(某事)，决定(settle or make certain，decide)[T+n](fml)：～a bargain达成交易;They～ed the agreement by shaking hands (with a handshake).他们握手表示达成协议。This mistake～ed his fate.这一错误决定了他的命运。

seal in(v adv)封住(闭)(vt)：The freshness/flavour will remain～ed in until the tin is opened. 食品的鲜美/食品的味道开听前一直会保持不变。

seal off (v adv)封锁(vt)：～off an area/a street封锁一地区/一街道;～off all the exits/all the entrances 封锁所有出口/所有入口;The gas pipe has been～ed off to prevent escapes.煤气管道被封住，以防泄漏。

seal up 堵塞，封牢：An avalanche of rocks～ed up the cave. 大量崩塌的岩石将洞口堵塞住。

→′sealant n 密封胶，防渗漏剂;′sealed adj盖章证实了的，封闭的，无法弄懂的;′sealing-wax n封蜡，火漆