单词:calculus of residues
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This is the VOA Special English Agriculture Report. Cows, sheep, goats and other animals can get mastitis, an inflammation in the udder, the organ where milk is produced. Milk from an untreated cow is still relatively safe to drink. But the milk is
Many teachers and parents have said it, it is sort of a thought ingrained in the American psyche that boys are better than girls at mathematics. But is it true? The lack of women mathematicians, engineers and physicists has often been cited as proof
(woman) Word comes from California of a new weapon in the war on household pests. Two scientists working for a firm in Anaheim, California, have developed a method to eliminate insects without using dangerous chemicals. The new poison? Hot air. The
This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?. [Spray sound.] Killing bugs? No. [Spray sound.] Deodorizing the bathroom? No. [Spray sound.] Checking for explosives, yes. Because chemists at the University of Califor
威士忌生物燃料技术 We know we shouldnt drink alcohol and drive. But whisky could help us be more environmentally friendly drivers. 谁都知道不能酒后驾车。但是,从威士忌副产品中可以提取出新的生物燃料给汽车提供