In this case you need to know the implementation class because you have to construct an instance of it from the information in the serialized certificate.

在这种情况下，您需要了解实现类，因为您必须从被序列化的证书信息中构建它的实例。

youdao

Explosion proof and protection class for instrument shall be met according to the requirements of Technical Specification, and relevant quality certificate documents shall be provided.

必须满足技术规格书对仪表防爆及防护等级的要求，并提供相应的质量证明文件。

youdao

The pilot held a current airline transport pilots licence ( helicopters and gyroplanes ) and a valid class one medical certificate. he had 3, 900 hours of operating experience.

肇事直升机的飞行员具备有效的航空运输飞行员执照（直升机和自转旋翼机）和一级体检合格证明书，并拥有3 ， 900小时的飞行经验。

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About 300 of the roughly 46, 000 students who took the class with an MIT professor filed into test-taking centers around the world in the hopes of earning a "proctored honor certificate" from the class signed by the professor.

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As a testament to the skills required for the job, all marine pilots must hold a Master Class 1 Certificate, which essentially allows one to captain a ship of any size, anywhere.

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