标签：空气过滤器 相关文章

英语听力文摘 English Digest 481、日出日落,傻傻分不清楚

Sunrise or Sunset? Yal: Don? Don: Yes, Yal? Y: We've been in this art museum for 5 hours now. And you've spent the whole time staring at that one photograph of sunset. D: Are you sure? Y: Of course I'm sure. You haven't budged. D: But are you sure it

发表于:2019-01-26 / 阅读(55) / 评论(0) 分类 英语听力文摘 English Digest

英语听力文摘 English Digest 363、鸟是如何呼吸的？

How Birds Breathe 鸟是如何呼吸的 Y: Don, flying is tougher than walking or running, right? So how come birds dont get winded and run out of breath? D: Actually, in terms of distance per unit energy, flying is pretty efficient . Plus birds have

发表于:2019-02-16 / 阅读(71) / 评论(0) 分类 英语听力文摘 English Digest

英语听力文摘 English Digest 390、干旱知识ABC

Drought For those of us lucky enough to always have enough food and water, it may be hard to imagine living through a drought . A drought occurs when for a variety of reasons, usually including a lack of rainfall and warm temperatures. Soil moisture

发表于:2019-02-16 / 阅读(40) / 评论(0) 分类 英语听力文摘 English Digest

英语听力文摘 English Digest 416、“二手”空气

二手空气 Big cities, with all their pollution , have an effect on trees No doubt. In the countryside. Say what? Big cities affect the trees in the countryside? You got it! According to a study conducted by Jillian Gregg, who now works at the EPAs

发表于:2019-02-16 / 阅读(42) / 评论(0) 分类 英语听力文摘 English Digest
最新学习文章
热门学习文章