He has come to be recognized as an expert in the problem of overpopulation and food supply.
由于他的经验促使他终于成为了公认的人口过剩和食物供应问题的专家。
Through my hands and fingers, I heard the sounds that one hears on a farm, the noises made by cows, horses, chickens and pigs.
通过手和手指,我听到了人们通常在农场所听到的声音--即牛、马、鸡、猪等叫出的声音。