These grooves help a slider fly on the certain height.

这些沟槽帮助滑块一定的高度上飞行。

youdao

I looked at the height of the bat, they than a fly high, I can only see the tiny spots of black spots on the fly.

我望着高处的蝙蝠，它们一个比一个飞的高，最后我只能看到星星点点的黑点在飞着。

youdao

In the height of the bat, they are also under the ring to catch insects, but why they want to fly so high?

在高处的蝙蝠，它们也打着圈捕捉昆虫，可是为什么它们要飞的那么高呢？

youdao

This suggested that the private jet had strayed from its original flight plan, but, in statements to police, the pilots said they had been authorised to fly at that height.

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"At the height of fly season, you can only use one leg, sometimes even just one foot, " says Koala.

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While the park has added newer amusements, most visitors come for the vintage attractions, including a two-tier carousel built in 1921, the Talaia, which raises guests with a rickety metal arm to a height of 550m above sea level, and the iconic Avio ride, modelled on the first plane to fly between Barcelona and Madrid.

BBC: Europe��s grand old theme parks