91热爆

S2 Ep 27. The amazing agility of a dragonfly leads to the creation of a new spy drone. Their four wings can move independently of each other, enabling them to fly forwards, backwards, sideways, up and down and suddenly stop and hover like a helicopter. This caught the attention of engineers who wanted to develop a small drone that could be used by the military as a spying device. In the future, this sort of technology might send back pictures from areas where it鈥檚 too dangerous for humans to go.
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