Herewith we are sending you a written contract under seal in two copies.

兹寄上盖有印章的契约一式两份。

Such certificates may be under Seal.

该等凭证应盖有印章。

He produced a written contract under seal.

他出示一张盖有印信的合约。

Storage: Keep it under seal in cool and dry place.

贮存方法：至于阴凉，干燥处密封保存。

The order requires the tape to be kept under seal.

该命令要求磁带密封保存。