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。
He wore a small black hat, very wide trousers, a moustache and carried a stick that he swung in the air as he walked.
他头戴一顶小黑帽,身穿一条非常宽大的裤子,嘴上留着小胡子,手提着一根他边走边在空中挥舞的手杖。