单词：high-altitude sickness
单词：high-altitude sickness 相关文章
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Two pilots recently set a new altitude world record for gliders. A glider is an aircraft that does not have an engine. They are pulled into the air by powered airplanes and then released. They are designed to ride warm, rising air to gain altitude. T
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to go all out to go though hell or high water 大多数的人都很钦佩那些力量充沛、勇往直前的人。这种人为了达到目的而采取行动的时候毫不畏惧。在认定了目标以
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