seal

• 指有鳍足的海生哺乳动物（海豹），也指用于密封的物件或物质（印章、封条、密封圈等）。

A noun referring to a marine mammal with flippers, or a device or substance used to close something securely.

1. AnimalA2formal

   A large marine mammal with flippers, living in cold seas.

   海豹

   • We saw a seal basking on the rocks.
   • Seals are excellent swimmers and divers.
   • The zoo has a new exhibit featuring seals.

   同义词pinniped

2. Stamp or closureB1formal

   A device or mark used to close something securely or to show authenticity.

   印章或密封

   • The document had an official wax seal.
   • He broke the seal on the envelope.
   • The bottle's seal was intact, ensuring freshness.

   同义词brandcachetclosureemblemfastenerhallmarkmarksignetstamptoken

3. Emblem or symbolB1formal

   A design or emblem used as a symbol of an organization or authority.

   印章

   • The presidential seal is displayed on the podium.
   • The company's seal appears on all official contracts.
   • The university's seal is engraved on the diploma.

   同义词badgecrestdeviceembleminsigniamarkstampsymboltoken

• 动词，表示密封、封闭某物使其不漏或不被打开，也指加盖印章或正式批准使其具有约束力或最终确定。

A verb used to indicate the act of closing or fastening something securely, or making something official or final.

1. Close securelyB1formal

   To close or fasten something tightly so that air, water, or other substances cannot pass through.

   密封

   • She sealed the envelope before mailing it.
   • The plumber sealed the pipe to prevent leaks.
   • Make sure to seal the container tightly after use.

   同义词caulkclosecorkfastenplugsecureshutstop

   反义词open

2. Make final or officialB2formal

   To confirm or finalize an agreement, decision, or deal.

   敲定

   • They sealed the contract with a handshake.
   • The victory sealed their place in the finals.
   • The treaty was sealed by the signatures of both leaders.

   同义词cementclinchclosecompleteconcludeconfirmratifysettlevalidate

   反义词breakcancelinvalidaterescindvoid

3. Prevent escape or entryB2formal

   To block or close off an area to prevent people or things from entering or leaving.

   封锁

   • The police sealed off the crime scene.
   • The border was sealed during the crisis.
   • They sealed the room to contain the gas leak.

   同义词barblockcloselockobstructseal offsecureshutstop

   反义词openunseal

短语动词变体seal inseal off