/si:l; sil/
n animal with flippers that lives near and in the sea and eats fish 海豹.

/si:l; sil/
n
1 (a) piece of wax, lead or other soft material, usu stamped with a design and fixed to a document to show that it is genuine, or to a letter, packet, container, etc to prevent it being opened by the wrong person; design stamped in this way 封蜡; 封铅; 火漆; 封条; 封印
*The letter bears the seal of the king. 这封信有国王的封印.
(b) piece of metal, ring, etc with an engraved design used for stamping a seal 印章; 图章. => illus 见插图.
2 thing used instead of a seal, eg a paperdisc stuck to a document, or an impression stamped on it 代替封印之物（如纸签或印记）.
3 (a) substance or device used to fill a gap, crack, etc so that gas or fluid cannot enter or escape （用以填充的）密封物质或装置
*a rubber seal in the lid of a jar 罐子盖儿里的橡皮密封圈
* I've bought a seal to put around the edge of the bath. 我买了一种密封胶涂在浴缸边缘上.
(b) closure made by this 密封
*The putty gives a good seal round the window. 窗户四周泥的油灰密封效果很好.
4 small decorative sticker like a postage stamp, esp one sold in aid of charity 印花贴签（尤指出售以捐助慈善事业的）.
5 (idm 习语) a ,seal of ap`proval formal approval 正式认可
*The deal needs the government's seal of approval. 这一交易需经政府批准. set the seal on sth (fml 文) be the high point in sth; complete sth 为某事物之顶点; 完成某事物
*This award has set the seal on a successful stage career. 获此奖标志着舞台生涯成就的顶峰.

v
1 [Tn] put a seal2 (1,2) on (eg a legal document) 在（尤指法律文件）上加封或盖印.
2 [Tn, Tn.p]
(a) ~ sth (down) stick down (an envelope, etc) 粘住（信封等）.
(b) ~ sth (up) fasten or close sth securely 封住某物
*sealed orders 密封指令
* seal the parcel (up) with adhesive tape 用胶带把包裹封住.
(c) ~ sth (up) close tightly or put a substance, etc on sth to stop gas or fluid entering or escaping 将某物密封住
*The jar must be well sealed. 这个罐子得封严实了.
* Seal (up) the window to prevent draughts. 把窗户封起来以防风.
3 [Tn] coat or surface (sth) with a protective substance, sealant, etc 给（某物）加保护层或面, 或涂上密封胶等
*seal the boat's hull with special paint 给船体涂上特种油漆.
4 [Tn] (fml 文) settle (sth); decide 解决（某事物）; 决定
*seal a bargain 成交
* Her fate is sealed, ie No one can stop what is going to happen to her. 她的命运已定.
5 (idm 习语) one's lips are sealed => lip.
6 (phr v) seal sth in keep sth in by sealing 将某物封住
*Our foil packets seal the flavour in. 我们用锡纸包装以保持原味. seal sth off prevent anybody or anything entering or leaving (an area, etc) 防止某人或某物进入或离开（某范围等）
*Police sealed off all the exits from the building. 警方把建筑物的所有出口都封锁住了.