单词:stray light emission
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Part III Listening Comprehension Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and
Lesson 43 Are there strangers in space? 宇宙中有外星人吗? First listen and then answer the following question. 听录音,然后回答以下问题。 What does the 'uniquely rational way' for us to communicate with other intelligent beings
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
STEVE EMBER: Im Steve Ember. FAITH LAPIDUS: And Im Faith Lapidus with EXPLORATIONS in VOA Special English. This week, we tell about one of the most recognizable objects in science fiction the laser. And we tell how the laser has made its mark in the
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
My companions and I then witnessed an unusual sight. The panels in the lounge were open, and since the Nautilus's beacon was off, 我的同伴和我,在这时亲眼看到一种很新奇的景象。客厅的嵌板敞开,由于诺第留斯号的探照