And so, when you think about how much cement concrete are consumed annually on the planet, this becomes a considerable point source of greenhouse gas emissions.

当你想到,在地球上每年要消耗多少的水泥混凝土的时候,这将是温室气体排放的,一个主要来源。

麻省理工公开课 - 固态化学导论课程节选

Twenty-thousand lives are annually sacrificed on the plantations of the South.

每年有二万多条生命,成了南方种植园的牺牲品

耶鲁公开课 - 美国内战与重建课程节选