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 showed that the average individual's sleep cycle is punctuated with peculiar bursts of eye-movements,
他指出,平常人的睡眠周期中不时伴有一阵阵奇怪的眼球队活动,