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。
Gandhi was thrown off a train and later a mail bus for insisting on travelling in the whites-only section.
旅行时,甘地因为坚持要坐白人座位,曾经先后两次被从一列火车与一辆邮车里扔出来。