seal

/sil/

fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters

Chinese meaning: 封条；印章

The document was secured with a wax seal to prevent tampering.

文件用蜡封封好以防篡改。

He broke the seal of the envelope and read the letter inside.

他撕开信封的封口，读了里面的信。