每当他试图讲话时，他都害怕得喉咙发紧说不出话来。

Every time he tried to speak, his throat closed up with fear.

《牛津词典》

他开始觉得喉咙肿胀发紧。

His throat began to feel swollen and constricted.

youdao

这些“验证”导致他得出结论，例如颠茄能够用来治疗喉咙痛因为颠茄导致健康人喉咙发紧。

Such "provings" led him to conclude that belladonna, for example, could be used to treat sore throats because it caused throat constriction in healthy subjects.

youdao