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According to Harry Vallentine, a Canadian engineer who is researching modern steam technology, a special tank measuring 2 by 10 metres could store over 750 kilowatt hours of energy as high pressure steam, enough to pull a two-cart train for an hour or so.
2018年12月六级真题（第二套）听力 Section C
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I spent all last week end researching what topics are popular, what words to use in captions and similar accounts to follow.
2018年12月六级真题（第一套）听力 Section A
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Professor Stephen Hawking has warned that the creation of powerful artificial intelligence A will be "either the best, or the worst thing, ever to happen to humanity", and praised the creation of an academic institute dedicated to researching the future o
2019年6月六级真题（第一套）阅读 Section C
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When they started researching the supply chain, they learned that only 2-3% of all Bison is actually grass-fed.
2019年12月六级真题（第三套）阅读 Section B