单词：duty cycles
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The story of how we have systematically observed the heavens begins in the days before recorded time. For primitive man, the sun reigned supreme. Its recurring cycles of light and darkness formed the
疯狂英语2001年
-Cities were a real paradox. They did offer dazzling new opportunities, but they also cut people loose from everything that they knew, from their tribe, from their land, from way to being that haven't really changed much for millennium. So they were
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General Douglas MacArthur: Thayer Award Acceptance Address delivered 12 May 1962, West Point, NY
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You're walking along the street. You need to go to the washroom desss...perately. What do you do? If you can't control yourself, you could be embarrassed to no end. Don't worry. Someone in San Francis
赖世雄中级美国英语
The limpidness lettuce still has a little life left,a new study finds that produce continue to respond to life kills which enable them to keep protecting themselves from insects,and perhaps even enhance their nutritional value to us.Scientists knew t
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The surface of Mars is etched with ancient river valleys and lake basins. Which makes researchers think that liquid water once flowed on the Red Planet. But how? Today, Mars is too cold for much, if any, liquid water to exist. And 3.8 billion years a
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Mike: Ha! That's what they make you wear at Captain Sub? Luke: No, I just like to dress like Popeye. Mike: Look, when you get a new job, you do have to deal with difficult people. Luke: You mean like the customers? Mike: No, like your family. Maggie:
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Frame In time division multiplexing systems, Frame is a sequence of time slots each containing a sample from one of the channels carried by the system. The frame is repeated at regular intervals, (nor
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记忆之歌 Song of Remembering Song of Remembering The Rentals I have written enough as enough to sing for a song of remembering Everything moves everyones laughing, moving through the city of passing Ive written enough, enough for a while, I have
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A: I need to know why I'm being charged $10 for a movie that I never ordered. B: Hmm. Your file shows that you watched Titanic Monday night. A: Monday night? Monday night I was at a great concert. B: Well, as they say, garbage in, garbage out. Let me
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By Carol Pearson Washington 25 May 2007 Women who do not want children, and those who do, are both getting new help. The U.S. government has approved a birth control pill that eliminates menstrual cycles, and it also has approved a product to help wo
2007年VOA标准英语（五月）
今天我们要学的词是in the line of duty。 In the line of duty意思是在执行公务的时候。North Carolina firefighters honored their comrades who were killed in the line of duty last year, 北卡罗来纳州的消防队员悼念了去年在
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讲解 失眠insomnia是一件十分痛苦的事情，经历过的人一定了解，想睡睡不着，又很没有精神的感觉。 为了克服insomnia，我们今天就来讲讲如何才能拥有一个完美的睡眠。 Shawn Stevenson is a clinic
英语悠选脱口秀
Howard: Hi, Todd. Todd: Hey, how's it going, Howard? So I heard that you're really into motorcycles. Howard: Ah, yes, I love motorcyles. I've been riding motorcycles since I was 15 years old. Todd: Oh, really. Wow! So, what's the allure of motorcycle
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This is SCIENCE FRIDAY. I'm Ira Flatow. You open the door of your fridge and the light goes on, right? What if the light in your fridge could stay on and be programmed to help your veggies taste better or be more nutritious? Why? Well, it turns out t
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Much of New Zealand has been very cloudy and cool so far this month. However, some inland places, especially Central Otago, have had hot weather. Usually February is our hottest month so the cool temperatures and winds for most of us are disappointin
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Dog Property Laws 狗的财产法则 1. If I like it,it's mine. 1. 我喜欢的东西，就是我的。 2. If it's in my mouth, it's mine. 2. 在我嘴里的东西，就是我的。 3. If I can take it from you, it's mine. 3. 我能从你那儿拿过来
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Chinese Academy of Sciences successfully launched a new sounding rocket, Kunpeng-1B, in Hainan Danzhou early Wednesday. The rocket reached a flight height of 300 kilometers for the first time. Its arrow configuration of altitude control system and ca
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