So many activities in health care are hidden, they're unwitnessed, but doctors are social animals, and they perform better when they see what other doctors do.

医疗保健中的许多活动都是隐藏的， 无人察觉，但医生是群居动物，当他们看到其他医生所做的事情时， 他们的表现会更好。

All of them agreed in believing the existence of Spectres: But the Latter contended, that for a Ghost to knock for admittance was a proceeding till then unwitnessed, and totally incompatible with the immaterial nature of a Spirit.

他们所有人都同意相信幽灵的存在：但后者争辩说，对于幽灵来说，敲门进入是一种直到那时都没有人目击的过程，并且与精神的非物质本质完全不相容。