As a communist I don't believe in heaven or the Bible but as a scientist I now believe in hell," said Dr. Azzacove. "Needless to say we were shocked to make such a discovery. But we know what we saw and we know what we heard. And we are absolutely convinced that we drilled through the gates of hell!的翻译：Explosion-protection certificate number 什么意思？中文翻译英文，英文翻译中文，怎么说？

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Explosion-proof certificate number

Explosion-protection certificate number

Explosion-proof certificate serial number

Explosion-proof certificate No.

Explosion-protection certificate number