n.[C]

1. 印章，圖章，印信
   He affixed his seal to the document.

   他在文件上蓋了印。

2. 封（印）；封印紙
   The envelope's seal was torn open.

   信封封緘被撕開了。

3. 封條；（裝飾用的）貼紙
   The seal on the jar was broken.

   瓶的封口被打開了。

4. 保證；批准；誓約
5. 象徵；標誌
   Their handshake was a seal of friendship.

   他們的握手是友誼的象徵。

6. 【機】密封墊；焊接

vt.

1. 封，密封[（+up）]
   She forgot to seal her letter before mailing it.

   她忘記在寄信前將信封上。

   He signed and sealed the document.

   他在文件上簽字加封。

2. 蓋章，蓋印於
   The treaty was signed and sealed by both governments.

   條約已經兩國政府簽字蓋章。

3. （以蓋章的方式）保證；確認；批准
   They sealed the bargain with a handshake.

   他們握手成交。

4. 密閉，閉緊；釘住
   The tube is sealed at both ends.

   這管子兩端是密封的。

5. 確定；決定[（+by/with）]
   The judge's words sealed the prisoner's fate.

   法官的話決定了這個囚犯的命運。

n.

1. 【動】海豹[C]
   The first time I saw seals was in an aquarium.

   我第一次看見海豹是在水族館裡。

2. 海豹（毛）皮[U]
   Do you know how much a seal coat is?

   你知道海豹皮大衣多少錢一件？

vi.

1. 捕海豹
   Sealing is prohibited in many countries.

   許多國家禁止捕海豹。

n.

1. a device or substance used to join two things together or render something impervious.
   ▸the state or fact of being joined or rendered impervious with a seal.
2. a piece of wax, lead, etc. with an individual design stamped into it, attached to a document as a guarantee of authenticity.
   ▸a design embossed in paper for this purpose.
   ▸an engraved device used for stamping a seal.
   ▸a decorative adhesive stamp.
3. a confirmation or guarantee:
   a seal of approval.
4. (the seal or the seal of the confessional) the obligation on a priest not to divulge anything said during confession.
5. the water standing in the trap of a drain to prevent foul air from rising.

v.

1. fasten or close securely.
   ▸ (seal something off) isolate an area by preventing or monitoring access to and from it.
2. apply a non-porous coating to (a surface) to make it impervious.
3. conclude, establish, or secure definitively:
   victory was sealed.
4. authenticate (a document) with a seal.

n.

v.