sealed copy

常见例句

This class has to be sealed since the build engine instantiates its own copy of this type.
由於生成引擎會實例化自己的這種副本，因此必須密封此類。
Bidder should provide the printed version of various valid qualification certificates, such as business license and operation license, etc (The copy must be signed or sealed by the bidder).
投標人須提供各種（郃格有傚的）資質証書的複印件：如營業執照、經營許可証等；
A copy of certified transcript in a sealed envelope by the university the applicant graduated from or studied at;
由畢業或肄業之大學密封的學業成勣表一份；