有一种理论认为滑行节省体力。因此研究人员用飞鼯猴——一种来自东南亚的哺乳动物，当它们滑行时会伸展出四肢，变成一张巨大的翼膜。
One theory suggests gliding saves energy. So researchers tested that idea using colugos-mammals from Southeast Asia that turn into giant skin sails when they stretch out their legs.
但是他的数字唱片却一飞冲天，由2009年的233000张飞涨至2010年的485000张。
But his digital album sales rocketed from 233, 000 in 2009 to 485, 000 in 2010.
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