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Called the hellhole of creation, the Afar Triangle lies at the junction of three continental plates which spread further each year. The oldest living lava lake and one of the lowest points on the planet. Geologists here can study the process that for
国家地理2007年
But despite the Mongol's attempts to master siege warfare, the Chinese were still much more advanced in their military technology. They responded by filling bombs with crude oil, molten metal, chemica
成吉思汗
研究显示太阳能发电站使用熔融金属可能造价更为低廉 While water circulates in this scale model of a concentrated solar power plant, a full-size plant uses molten salt. 水在这种规模的太阳能集中发电厂循环时,这座实
VOA标准英语2016年(三月)
如果随便翻阅雅思阅读真题，我们常常会发现它涉及的词汇广度难度绝对不容小觑，甚至出现在GRE红宝书里的超强词汇也会频频亮相。于是，不少同学在初识雅思时都会产生畏难情绪，滋生出
实用英语
We were left with this atmosphere made of molten rock and vaporous rock. It took millions of years for that atmosphere to fall out and to be replaced by an atmosphere made up of nitrogen and carbon dioxide and water vapour. These new gases came from
探索与发现2014年
Like Mercury, the earth takes a beating from the sun's violent temper. Flares, sun storms and other solar hissy fits can cause electronic mayhem for the satellites that roam above our heads. Fortunately, the earth is protected from this radiation by
自然百科2012年