词典释义：
a device or substance that is used to join two things together so as to prevent them coming apart or to prevent anything passing between them
封条，密封装置
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attach a draught seal to the door itself .给门装上防风密封条。
[in sing.]the state or fact of being joined or rendered impervious by such a substance or device
密封，密封状态
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many fittings have tapered threads for a better seal .为了更好地密封许多装置都用了锥形线。
the water standing in the trap of a drain to prevent foul air from rising, considered in terms of its depth
水止，水封（根据排污管道深度U形管中防止臭气上升的存水）。
a piece of wax, lead, or other material with an individual design stamped into it, attached to a document to show that it has come from the person who claims to have issued it
封蜡；封铅；封缄。
a design embossed in paper for this purpose
印章，图章。
an engraved device used for stamping a design that authenticates a document
（证明文件效力的）公章。
〈喻〉 批准，确认
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the monarchy is the seal of the unbroached integrity of the Isles .君主制是该群岛无可争辩的完整性的保证。
a decorative adhesive stamp
装饰性的背面涂胶水的邮票（印花）。
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（天主教）告解保密（指神父有不得泄漏告解者的忏悔内容的义务）
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I was told under the seal .我是在告解保密的情况下被告知的。
fasten or close securely
系紧；封牢
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he folded it ,sealed the envelope ,and walked to the postbox .他折好信，封上信封，向邮筒走去。
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把…封闭在内。
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封锁
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anti-terrorist squad officers sealed off the area to search for possible bombs .反恐小组军官为搜寻可能存在的炸弹封锁了该地区。
apply a non-porous coating to (a surface) to make it impervious
在（表面）加一层不渗透的涂料层使不渗水
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the pine boarding should be sealed with polyurethane .松木板应该涂上聚氨酯以防渗水。
fry (food) briefly in hot fat to prevent it losing too much of its moisture during subsequent cooking
（为避免烹调时失去过多水分，将食物放在热油中）快速煎炸
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heat the oil and seal the lamb on both sides .把油加热，并把羊肉两面都炸一下。
fix a piece of wax or lead stamped with a design to (a document) to authenticate it
（给文件）加封；盖印。
conclude, establish, or secure (something) definitively, excluding the possibility of reversal or loss
达成；确认；保证
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to seal the deal he offered Thornton a place on the board of the nascent company .为达成交易他在新成立公司的董事会里给桑顿安排了一个职位。
a fish-eating aquatic mammal with a streamlined body and feet developed as flippers, returning to land to breed or rest
海豹。
another term for
同<Bold>SEALSKIN</Bold>.
hunt for seals
猎捕海豹。
a member of an elite force within the US Navy, specializing in guerrilla warfare and counter-insurgency
“海豹”小队（擅长游击战和平叛的美国海军的一支精锐部队）。
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my （或his 等）lips are sealed used to convey that one will not discuss or reveal something 守口如瓶，闭口不谈 -
put （或set ）the seal on give the final authorization to 批准；确定the UN envoy hopes to set the seal on a lasting peace ． 联合国特使希望能确保持久和平 -
provide or constitute the final confirmatory or conclusive factor 提供（或构成）最终证实（或决定）的要素
the rain set the seal on his depression ． 这场雨终于使他消沉起来 -
seal someone's （或something's ）fate irrevocably determine or cause a bad or unpleasant outcome for someone （or something） 注定命运（常指产生不幸或不愉快的结局） -
set （或put ）one's seal to （或on ） mark with one's distinctive character 给…盖印；打上显明的烙印it was the Stewart dynasty which most markedly set its seal on the place ． 正是斯图亚特王朝给这个地方标上了它显明的印记
"Middle English （in sense 2）：from Old French
