单词：adjustable (blade) propeller
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Unit 4 When was it invented? [00:07.36]Section A [00:09.76]Language Goal [00:11.54]Talk about inventions [00:14.31]1a GROUPWORK [00:17.59]Look at the things below. [00:20.27]In what order do you think they were invented? [00:24.94]Number them [1-5] (
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灵通少儿英语第三册
Bladeless Wind Generator Safe for Birds Wind turbines are tall structures with large blades used to produce electricity. They are useful sources of low-cost, renewable energy. But they can also be deadly to birds and bats. The turbines large blades t
2015年VOA慢速英语(七)月
Bird-friendly Bladeless Wind Turbine Mimics Nature Energy created by conventional three-blade wind turbines is cheap, sustainable and pollution-free. But according to current estimates, the devices' fast-moving blades kill up to 300,000 birds annuall
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ROBERT SIEGEL, HOST: Ridley Scott's science fiction film Blade Runner was a modest hit in theaters in 1982 and a massive one later on video. Scott's punk noir dystopia initially got mixed reviews, but the director kept re-cutting his film. And by 200
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自拍是普通人最喜欢的一种消遣方式，而目前有一种提升自拍效果的新神器正迅速成为我们大家生活的一部分。它就是selfie stick（自拍杆）。 A selfie stick is a monopod used to take selfie photographs by
英语口语