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。
They sting or bite without provocation; they fly uninvited into our rooms on summer nights, or beat ageist our lighted windows.
它们无缘无故地又叮又咬;夏天的晚上,它们未经邀请便飞到我们房间里,或者对着露出亮光的窗户乱扑乱撞。