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keen a.渴望的，热心的；理解力强的，敏锐的 keep v.保留；保持；遵守；饲养；管理 kettle n.水壶 key n.钥匙；键；关键；答案 a.关键的 keyboard n.键盘 vt.用键盘

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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

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kill----------杀死 kilogram---公斤 kite---------风筝 kind--------种类

SSS 2011-01-24

This is Scientific American's 60-Second Science. I'm John Matson. Got a minute? In a laboratory vault outside Paris is a small cylinder of platinumiridium alloy that serves as the standard for all mass measurements worldwide. By an 1889 international

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beneath [bi'ni:] prep.在下面；ad.在下面 convenient [kən'vi:njənt] a.方便的 examine [ig'zmin] v.考试，审查，检查 grape [greip] n.葡萄 kilogram ['kiləgrm] n.千克，公斤 mother ['mʌə] n.母亲 polite [pə'lait] a.有礼貌的，

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