单词：magic number nucleus
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With A Little Magic, Small Budget Horror Films Pack A Big Punch play pause stop mute unmute max volume 00:0000:00repeat repeat off Update Required To play the media you will need to either update your browser to a recent version or update your Flash
2016年NPR美国国家公共电台9月
Science and Technolgy. 科技。 Modern alchemy. 现代炼金术。 Turning a line. 进入新的一行。 The race to extend the periodic table continues. 扩展元素周期表的比赛仍在继续。 ONE of the first inklings that chemistry has an u
经济学人科技系列
As It Is - Remember Your Chemistry Classes? An international team of researchers recently reported creation of a new element that is 40 percent heavier than lead. The researchers successfully developed what they are calling Element Number 117 at a la
2014年VOA慢速英语(八)月
Lesson VWhat's the Missing Number? Let's talk. Boys and girls, look here. What's the missing number? Sorry, I don't know. Think it over.Sixteen minus two is fourteen.Eight minus two is six. Oh, I see.The missing number is eight. What a clever boy! Wh
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Let us pause for a moment and consider the structure of the atom as we know it now. Every atom is made from three kinds of elementary particles: protons, which have a positive electrical charge; electrons, which have a negative electrical charge; and
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