Then in the 1930s, a doctor named Hans Selye, S-E-L-Y-E, first used this term to describe a human’s reaction to a demand placed on it, pleasant or not.
Ps.这句话描写的是“stress”的首次使用历史情况。
it指的是什么?
我的想法是 a human’s reaction to a demand placed on it.理解为 a demand was placed on human(人类被要求 ),所以it指的是应该是human,但human的代词应该不是it吧,那如果不是的话,it指代的是什么呢?