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The journey from stream to ocean begins in our backyards and farmg, Precipitation comes down, exactly , everywhere -- in different forms, It may rain, 阅读全文
posted @ 2025-08-29 09:57
tianyunchuan
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About half of New York City's yearly water supply travels through a system of underground tunnels. Once through these tunnels, the water becomes drink 阅读全文
posted @ 2025-08-28 13:16
tianyunchuan
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氢氧化钠的俗称主要有以下几种： 烧碱这是最常用的俗称，因为它具有强烈的腐蚀性，能“烧”伤皮肤和有机物。 火碱原因同上，强调其腐蚀性如火烧一般。 苛性钠这是从英文 caustic soda 直译过来的，“caustic”就是腐蚀、苛性的意思。 浓氨水是氨气（NH₃）的水溶液通常所说的“氨水”指的就是它 阅读全文
posted @ 2025-08-25 19:27
tianyunchuan
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【B】 Lin Dong: Can you imagine visiting the Great Pyramids of Egypt on a school day in the future?Lu Yao : It won’t be possible unless I cut school and 阅读全文
posted @ 2025-08-22 09:20
tianyunchuan
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【B】 Challenges in teamworkLu Yao: I can’t believe we lost.Yiming: That’s so sad. But what did we do wrong?Lin Dong: I think the biggest problem was th 阅读全文
posted @ 2025-08-18 09:35
tianyunchuan
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posted @ 2025-08-11 10:07
tianyunchuan
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B1 Listen, read and think Listen to Harry’s conversation with his greatgrandma. What do they find in the attic? What did people use these things for? 阅读全文
posted @ 2025-08-04 16:08
tianyunchuan
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