在PTE中,无论是Summarise Spoken Text 还是 Re-tell Lecture的考题大都是从真实的讲座或者演讲中截取的,中间经常经常夹杂很多不同的环境音.很多同学都反映有时未必是听不懂,而是听不到. 鉴于此,墨尔本文波雅思PTE专门为大家总结了真实讲座的PTE练习音频,相比新闻音频来说,整体更加接近PTE考试的真题,内容方面,我们也会为大家提供考试中存在的近似题,最近我们会持续更新,敬请期待!
I have here a different configuration, different set of magnet, I put it on a rail, imagine magnetic field is the same along this rail. So the specific conductor will move without any friction on this rail, let’s see if it works. I’m going to cool it a little bit more. And then I’m going to lock it on top of this rail. And you see it just levitates. If I had 20 meters long rail, it will just go without any friction. The demand of energy I need to move this disk is minimum because there is not friction. If I take this circular rail, you see this is just two circulars of magnets. And if I take the disk and put it on the rail, you see that it immediately starts moving and I gave it a little push, that’s enough because it will keep rotating until it warms up, so there is no friction at all. Now I can do the same thing on this rail, but upside down because again this is not magnetic repulsion. So if I take this disk and pin it below the rail, it would just move below the rail. Again forget everything you know, this is not classical physics, you forgot, ok.
