close aloft
近在空中
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Shortly afterward, the "Yuri I, " constructed by students at Nihon University in Japan, made a crucial discovery: They found they could stay aloft for longer if the helicopter's blades were as close to the ground as possible.
WSJ: Flight of Fancy: The Sky's the Limit for Team That Rises to the Occasion
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