They were supervised by 72 people who held a licence from the Home Office that allowed them to use primates in research; each experiment had to be licenced, too.

当面对72个人手持英国内务部颁发的许可证允许他们在研究中使用灵长类动物时，他们十分惊讶；每一项研究的进行也都必须经过许可。

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Getting a vaccine through its numerous trials to be licenced for public use was the big thrill in Mr Hilleman's life, he said.

ECONOMIST: Obituary