But in the past few years, a brave group of scientists, fewer in number than male nurses, has been trying to uncover the physiology of laughter and its provable medical benefits.

• 但在过去几年，一群勇敢的科学家，人数可比男护士少，已经试图揭示笑的生理机能以及可以证明的笑在医学上的益处。