单词：water jet suction apparatus
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Boculy found so many elephants for us that we gradually became accustomed to the big beasts 鲍克里为我们找到了许多头大象，我们逐渐适应了大型动物， and set our cameras many times for them without fear. 多次在准备摄像机
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When we change a liquid into vapour, and cool this vapour till it is liquid again, 将水加热成水蒸气, 然后对其进行冷却直至再次液化, we are said to distil the liquid, and the apparatus for doing this is called a still. 这个过程就
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Mike出差刚回来，被时差折磨得痛苦不堪，向同事Larry咨询缓解时差的好办法。Larry说， Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle
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Section 45 Swimming etc. The crawl, the backstroke, the breathstoke and the butterfly, what are these? They are the different strokes we can use when swimming. There are others, but these are the main
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Fish Use Whole Bodies When They Eat Fish are animals that live in the water. They are also vertebrates animals that have a backbone and a spine. They have gills that permit them to take oxygen from the water. But have you ever wondered how vertebrate
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Mike出差刚回来，被时差折磨得痛苦不堪，向同事Larry咨询缓解时差的好办法。Larry说， Larry: Some people take herbal medicine, but there's really no solid proof that it works. Some people take sleeping pills and try to sle
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