操作四：把纸张两边向内折叠，只折一半，折成类似于翅膀的形状，再放下来。
Operation 4 -Fold sides inward, fold in half, fold wings down.
他建议采用电动机或者有形状记忆功能的材料来反复击打软体契形翅膀的末端，让水产生向后的涟漪从而获得向前的推力。
He suggests using electric motors or shape-memory materials to repeatedly flick the end of a flexible, wedge-shaped wing, creating a wave that ripples backwards and generates forward thrust.
机器的翅膀从形状上与天然翅果的翅膀相似。
The wing of the vehicle is similar in size to a natural samara wing.
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