单词：initial corona voltage test
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闭着眼睛飘单词 四级词汇
World First Aid Day started in the year 2000. The International Federation of Red Cross and Red Crescent Societies (IFRC) introduced it to raise global awareness of how first aid can save people's lives in everyday situations. It occurs on the second
世界节假日博览
This is Scientific American 60-Second Science, Im Cynthia Graber. This will just take a minute. Heres one space mission that is definitely going to be unmannedNASA is going to the sun. The Johns Hopkins University Applied Physics Laboratory is buildi
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China has long depended on coal-burning power plants to fuel its explosive growth over the past three decades. As a result, air pollution has risen to alarming levels in central and eastern regions. Policymakers have been working hard to shift the co
2017CRI中国国际广播电台
vacant a.空的；未被占用的 vain a.徒劳的；自负的 valid a.有效的；正当的 vapour n.汽，蒸气 variable a.易变的 n.变量 variety n.多样化；种类；变种 various a.各种各样
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