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12. Stop the Noise Mr. Chen is talking to his neighbor Mrs. Wang. C: May I have a word with you? W: Sure. What's the problem? C: It's about your son. I'm tired of his making so much noise at all hours
15 Talking to a Mechanic GLOSSARY mechanic a person whose job is to maintain and repair cars or other types ofmachines * Do you pay a mechanic to change the oil in your car, or do you do it yourself? engine the inside part of a car that makes it move
英文歌词: It's easy to feel like You're all alone To feel like nobody knows The great that you are The good that's inside you Is trying so hard to break through[00:29.91]Maybe it's your time to lift off and fly You won't know if you never try I will
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Common batteries are electrochemical cells. And they may get better thanks to living cells: the multicellular organism called brown algae. Lithium ion
Gun Silencers 所谓消声手枪也不可能是完全无声,只是将声音尽量降低。手枪的消声方法有很多. 手枪的声音主要来自子弹出膛,空气冲出枪口是巨大的压力对外面的空气引起的冲击震动.消声器是