受激发射（凝聚态）

VOA慢速英语2013 EXPLORATIONS - The History of the Laser

EXPLORATIONS - The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can

发表于:2018-12-16 / 阅读(54) / 评论(0)

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SSS 2012-03-15

This is Scientific American 60 Second Science, I am Karen Hopkin, this will just take a minute. Every year, about 10 million tons of paper winds up in American landfills and incinerators, which is not only wasteful but adds CO2 to the atmosphere. Rec

发表于:2019-01-08 / 阅读(70) / 评论(0)

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VOA标准英语2013--The History of the Laser

The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the sci

发表于:2019-01-12 / 阅读(53) / 评论(0)

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原版英语对话1000个:446 Key Lime Pie

Senem: Hey, Shawn, I heard that you are really good at making key lime pie. Shawn: Key lime pie, that's my special recipe. I just can't give that out to anybody. Senem: Yes, you can. Please. I really want to make it tonight. Please tell me. Shawn: Wh

发表于:2019-01-20 / 阅读(52) / 评论(0)

原版英语对话1000个

【英语语言学习】镭射器的历史

Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the science of the future to eve

发表于:2019-01-24 / 阅读(66) / 评论(0)

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发表于:2019-02-17 / 阅读(64) / 评论(0)

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学英语单词

absorbent refining

adaptive filtering

Almighty God

an appetite for learning