例如，鸟类的体型越小，飞行动作就越灵敏——天鹅就需要两个足球场大的面积才能完成起飞和抬升动作，而蜂鸟就可以像直升机一样垂直起飞。
The smaller the bird, for example, the more agile the flying — a swan may need the equivalent of two football fields to take off and get lift, while a hummingbird can rise like a helicopter.
“蜂鸟能像直升机一样悬停，且时间可以长达一个半小时，中间不间断，”托巴尔斯克说。
"A hummingbird can hover like a helicopter for one and a half hours, nonstop," Dr. Tobalske said.
众所周知，蜂鸟的翅膀拍打速度极快，它即可以凌空悬停，也可以快速向前飞行和向后飞行，其飞行的精准度甚至超过了直升机。
Hummingbirds are well known for their wing speed and ability to hover and fly forward and backward with more precision than a helicopter.
蜂鸟可以像直升机那样不停地盘旋一个半小时“，托巴尔斯克博士说，”没有别的鸟能做到这一点“。
“A hummingbird can hover like a helicopter for one and a half hours, nonstop,” Dr. Tobalske said. “No other bird can do that.”
蜂鸟可以像直升机那样不停地盘旋一个半小时“，托巴尔斯克博士说，”没有别的鸟能做到这一点“。
“A hummingbird can hover like a helicopter for one and a half hours, nonstop,” Dr. Tobalske said. “No other bird can do that.”
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