Mr. Jones is a renowned international authority on the problem of overpopulation in developing countries.
琼斯先生在发展中国家人口过剩问题方面是声誉卓著的国际权威。
A born teacher, she thought she could turn a deaf-blind person into a useful human being.
她是一个天的教师,认为自己可以把一个聋盲人变成一个有用的人。