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1·Penguins cannot fly at all.

企鹅一点都不能飞。

2·He let fly at me with his fist.

他挥拳打我。《牛津词典》

3·It can fly at a speed of about 200 miles per hour.

它能以每小时200英里的速度飞行。

4·We would fly at 480 kilometres per hour, avoiding traffic lights, busy roads and speeding tickets.

我们能以每小时480公里的速度飞行，避开红绿灯、拥挤的道路和超速罚款单。

5·We could fly at 480 km per hour, avoiding traffic lights and busy roads.

我们可以以每小时480公里的速度飞行，避开红绿灯和繁忙的道路。

6·Fireflies give off flashes of light when they fly at night.

萤火虫夜间飞行时发出闪光。《新英汉大辞典》

7·They fly at first cosmic velocity.

他们以第一宇宙速度飞行。

8·They fly at first cosmic velocity.

他们以第一(宇)宙速度飞行。

9·Many fly at night, when temperatures are cooler.

很多鸟类在温度较低的夜间飞行。

10·The jet can fly at twice the speed of sound.

这喷气式飞机能以两倍于音速的速度飞行。