单词:upsilon meson
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This is Scientific American's 60-Second Science, I'm Steve Mirsky, got a minute? Every Star Trek fan knows theres matter and antimatter, but why is there apparently so much more matter than antimatter?Scientific American's JR Minkel: Two recent exp
发表于:2019-01-08 / 阅读(67) / 评论(0)
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Part 2. Astronomers discover solar system. Keywords. another solar system, planets, challenge. Vocabulary. constellation, astronomy, full-fledged, Jupiter. A. Listen to a science report, write down the information about the new solar system. What sci
发表于:2019-02-15 / 阅读(39) / 评论(0)
Step by Step 3000 第二册