The ISSN key title and number are vocabularies controlled by the ISSN International Centre.
ISSN识别题名和号码是由ISSN国际中心(ISSN International Centre)控制的词汇表。
2
In practice, you should place the certifier under lock and key and may even put a guard (an actual person!) in charge of handing out the key via a very controlled mechanism.
实际上，您应该把证明锁起来再放上警卫(真正的人！)，通过严格控制的机制传递钥匙。
3
A key goal of world IPv6 Day was to expose potential issues with real-world IPv6 use under controlled conditions.