单词：ventilated commutator
通风式整流器,空气冷却整流子
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Lesson 64 The Channel Tunnel海峡隧道 First listen and then answer the question. 听录音，然后回答以下问题。 Why was the first tunnel not completed? In 1858, a French engineer, Aime Tho
发表于:2018-11-28 / 阅读(487) / 评论(0)
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RACHEL MARTIN, HOST: An update now - last month, an unventilated tractor trailer smuggling migrants across the border in San Antonio became a death trap. Ten people died from the heat. Late yesterday, a federal grand jury indicted the driver, James B
发表于:2019-01-16 / 阅读(198) / 评论(0)
2017年NPR美国国家公共电台8月
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