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It's a sunny day. Oxygen in the water increases and the fish crowd together. 今天阳光明媚。冰下的含氧量提高，鱼群的密度会很大。 A 2,000-meter fish net quickly sinks to the bottom. 长达两千米的渔网很快沉入水底。

发表于:2018-12-04 / 阅读(96) / 评论(0)

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发表于:2018-12-04 / 阅读(376) / 评论(0)

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发表于:2018-12-07 / 阅读(156) / 评论(0)

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发表于:2018-12-13 / 阅读(172) / 评论(0)

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This is Scientific Americans 60-Second Science. Im Cynthia Graber. This will just take a minute. The Chesapeake Bay could get helped by a new antipollution expert: farmed oysters. For decades, the Chesapeake has been plagued by excess nutrients, such

发表于:2018-12-24 / 阅读(111) / 评论(0)

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发表于:2018-12-31 / 阅读(186) / 评论(0)

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Todd: OK, Michael, you are into spear fishing! Michael: Yes, I enjoy going spear fishing Todd: OK. Can you talk about that a bit. Michael: Yeah, sure. Spear fishing basically is a sport that you dive under the wate with the aid of flippers, wet suit

发表于:2019-01-02 / 阅读(112) / 评论(0)

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This is Scientific Americans 60-Second Science. I am Cynthia Graber. This will just take a minute. Solar panels typically convert sunlight into electricity or heat. But photosynthetic vegetation converts sunlight into chemical energy. Now M.I.T.s Dan

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发表于:2019-01-05 / 阅读(136) / 评论(0)

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One main goal in the renewable energy field is to find an efficient, inexpensive way to split water into hydrogen and oxygen. The hydrogen could then be used as a fuel source for vehicles or fuel cells. Typically, an electric current breaks the water

发表于:2019-01-08 / 阅读(139) / 评论(0)

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American swimming great Michael Phelps remains on track to win an unprecedented eight gold medals at a single Olympics. VOA's Jim Stevenson was at China's National Aquatic Center as Phelps relied on three other teammates Monday to win a thrilling re

发表于:2019-01-08 / 阅读(100) / 评论(0)

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Mars 火星 Mars is a planet. 火星是行星。 It is next to the Earth. 它紧邻地球。 Its size is about one fourth of the Earth. 它约有四分之一个地球大。 Mars is not far from the Earth, but the environment is very different. 火星离

发表于:2019-01-10 / 阅读(96) / 评论(0)

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发表于:2019-01-12 / 阅读(102) / 评论(0)

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发表于:2019-01-20 / 阅读(90) / 评论(0)

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This week on Why Tell Me Why, we are finding out why the oceans are so salty. So the oceans are salty because the oceans have been around, lets say, for over five hundred million years. And over the course of time what we found out is that weve alway

发表于:2019-01-22 / 阅读(127) / 评论(0)

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Reading water meters in an unfamiliar part of town, I came upon a house with no number. Then I noticed an elderly man gardening at the first house on that block. Excuse me, I said to him. Are you Number One?He smiled and replied, My wife thinks so!No

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swimming pool 游泳池 changing room 更衣室 shower 淋浴 diving platform 跳台 ten-meter platform 10米跳台 five-meter platform 5米跳台 three-meter springboard 3米跳板 one-meter springboard 1米跳板 diving pool 跳水池 non-swimmer's pool 浅水池 swimmer's po

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adjustable barrier guard

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