铁质夹杂物磁力分离器

跟艾米莉一起学口语第40期:变成

change into把...变成... You can't change iron into gold. 你不能把铁变成金。 I want to change dollars into pounds. 我想把美元换成英镑。 A:Yesterday I bought a sweater from your store.and I'm afraid it's too small for.so I want to

发表于:2018-12-26 / 阅读(46) / 评论(0)

跟艾米莉一起学口语

SSS 2008-06-04

This is Scientific American's 60-Second Science, I am Cynthia Graber.This'll just take a minute. On earth, snow crystals as we all know, form from frozen water. But scientists believe there're also flakes that fall on Mercury, and they're made of iro

发表于:2019-01-07 / 阅读(55) / 评论(0)

Scientific American(六)月

英语听力：自然百科地球力场 Earth's Force Field—2

Radiation causes damage at the most fundamental level. It mutates the blueprint of life, DNA. Earth's magnetosphere is our crucial defense. It's so fundamental to our evolution and continued existence that the race is on to understand why it's changi

发表于:2019-01-22 / 阅读(35) / 评论(0)

自然百科2011年

英语听力：自然百科地球力场 Earth's Force Field—7

The loss of the magnetic field has a catastrophic impact on the planet's evolution. Mars becomes the red planet we see today. If earths magnetic protection continues to fade, would it suffer the same fate? If it vanishes completely, the planet might

发表于:2019-01-22 / 阅读(56) / 评论(0)

自然百科2011年

英语听力：自然百科地球力场 Earth's Force Field—8

Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, and that's where causes all the magnetic field. But it's too hot inside the Earth, that can't happen

发表于:2019-01-22 / 阅读(48) / 评论(0)

自然百科2011年

【简明语法】15.1 并列结构作主语时谓语用复数

Reading and writing are very important. 注意：当主语由and连结时，如果它表示一个单一的概念，即指同一人或同一物时，谓语动词用单数，and 此时连接的两个词前

发表于:2019-02-06 / 阅读(29) / 评论(0)

英文语法词汇

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alternating expression