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。
From the shore line, out to a distance which may be anywhere from a few miles to a few hundred miles,
从海岸线向大海延伸几英里到几百英里的区域是大陆架慢坡,