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For nearly 130 years, the worlds scientists have used a singular small, metal cylinder to define the exact weight of a kilogram. But that is about to change. The cylinder was made in 1889 of platinum and iridium metals. It is called the Grand K. The
This is Scientific American 60 Second Science, I am Steve Mursky, Got a minute? Obese people have higher risks for diabetes, heart disease, arthritisand injuries in car accidents? Yes, in part because theyre far less likely to wear a seat belt. Thats
数量 Quantity (一) Let's talk about the problem of quantity. 我们谈谈数量的问题吧。 You'll issue a certificate of quantity and weight. 你们必须出具数量和重量证明书。 The package number and quantity are identical with
英语新词:这些meter后缀单词 你理解对了么? anemometer n. 风力计,[气象] 风速计。 audiometer n. [耳鼻喉] 听度计,听力表;测听计;音响测定器。 barometer n. [气象] 气压计;晴雨表;显示变化的事物
A joint geological expedition of 27 members from China, France and Italy has discovered another tiankeng, or giant sinkhole cave, in south China's Guangxi Province. A 350-meter-deep pit with nearly vertical walls... The newly-discovered tiankeng look
Todd: Mike, you're giving tips about weight training and we've talked about upper body. Now what about lower body and legs? I actually don't want to lift weights with my legs. I just... It is OK if I just skip it? Mike: Well, you should do your legs