Applying the most conservative estimates to current demographic trends, the human population will increase by about three billion people by then.
按照对目前人口趋势的最保守估计,到那时人口将增加约30亿人。
Of all those trends, however, the spread of water shortages poses the most immediate threat.
然而,在所有这些趋势中,水资源短缺的蔓延构成了最迫切的威胁。
just empirically speaking about the Harvard students, looking the trends and statistics-- empirically speaking, Americans are the most generous people in the world.
或只是说哈佛学生,根据发展趋势和统计,美国人是世界上最慷慨的人。
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