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.
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。
Hummingbirds are well known for their wing speed and ability to hover and fly forward and backward with more precision than a helicopter.
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。
Forward right wing to body fairing has several loose screws.
右大翼机身整流罩前部有几颗螺钉松动。
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