单词：stairstep generator
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[00:04.00]flight [00:06.22]n.飞翔，飞行；航班；航程；楼梯的一段 [2]逃跑，溃退 [00:08.44]fling float flock [00:11.62]vt.(用力地)扔,抛,丢 v./n.漂浮,浮动 n.(禽,畜等的)群;大量v.群集,成群 [00:14.81]flood floor [0
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Exercise 4-11 : Voiced and Unvoiced Sounds with T This exercise is for the practice of the difference between words that end in either a vowel or a voiced consonant, which means that the vowel is lengthened or doubled. Therefore, these words are on a
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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
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Exercise 6-2 : Double Vowel with R CD 3 Track 44 Refer to the subsequent lists of sounds and words as you work through each of the directions thatfollow them. Repeat each sound, first the vowel and then the [ər], and each word in columns 1 to 3. We
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RAY SUAREZ, HOST: After Harvey and Irma, the hurricane season wasn't over. Hurricane Maria made landfall on Puerto Rico as a massive Category 4 storm. Months later, the power supply is still spotty, and thousands of homes still rely on generators. Da
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JUDY WOODRUFF: Next: the possibilities of getting more energy through water. Humans have long harnessed the power of water to perform work. In modern time, hydroelectricity, generated by the power of water flowing through turbines at the base of dams
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