单词：lactose molasses
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[00:04.00]Just be thankful for what youre given, hear? 对你拥有的心怀感恩就行了 [00:08.20]You already here longer than you supposed to 你已经活得比预期的久了 [00:14.88]Some nights Id have to sleep alone 有时候我晚上得一个
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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The ability to digest milk as adults, and as infants, actually, is due to the expression of an enzyme called lactase. That's the University of Pennsylvania's Sarah Tishk
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This is Scientific American 60 Seconds. I'm Cynthia Graber. This'll just take a minute. In Europe and the near east, people went from being mobile hunter gathers to more settled agriculture way of life. But in Africa, no matters domesticated animals
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Experts Worry That Road Salt Harms US Waters Communities in the Northern parts of the United States have used salt to keep icy roads safe during winter for many years. But, some experts now say salt harms nearby fresh water supplies. Putting salt on
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At the same time, methanogens can use hydrogen and carbon dioxide produced by other bacteria to generate methane, 同时，产甲烷菌可以使用其他细菌产出的氢和二氧化碳以生成甲烷， which can reduce the total volume of gas by u
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