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.
最明显的推力来自于手臂的向后推水，就像圆盘明轮那样。
The most obvious production of thrust comes from pushing back on the water like a paddle wheel.
以右手和右手臂的力量抵抗右脚向后的推力来加深你弓柄的曲度。
Draw your Bow into a deeper curve by using your right hand and arm to resist the backward push of your right foot.
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