单词：open air condenser
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Beijing will launch a pilot program to equip schools and kindergartens with air filtration devices. Smog has been a significant issue in the Chinese capital this winter. I was coughing just now, I always wear mask, from school to home. The air is cho
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Joan : Boy, it's really stuffy here. Drake : You're right. We need some fresh air. Joan : Let's turn on the air-con. Drake : Why not just open the window? Joan : That's even better. 我们需要新鲜空气 琼 ：乖乖，这里面可真闷啊。 德雷
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On airplanes, cabin pressure changes during takeoff and landing to help passengers breathe easy at high altitudes. These changes in air pressure may make adults ears feel a little funny, prompting a few yawns to equalize the pressure. But for babies,
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21. 疑问词+shouldbut 结构，这个结构表示过去的意外的事，意为nonebut，可译为除了还有谁会，岂料，想不到竟是等。 Who should write it but himself? 22. who knows but (that)和who could shouldbut结构，这个结构
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