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。
I limited myself to two modest ambitions: to do physical exercise every morning and to read more of an evening.
我深知这些问题,于是,今年我对自己的计划要严加保密,只给自己定下两项适中的任务;每天早上锻炼身体,每天晚上多看点书。