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。
To confirm the utility of continuous wave Doppler echocardiography in assessing pulmonary artery wedge pressure in patients with mitral regurgitation.
目的探讨连续波多普勒超声在评估二尖瓣返流患者的肺动脉楔压中的作用。
Through the conduction theory based on one dimension stress wave theory, the reflection and transmission phenomena of waves on the surface of the wedge have been analyzed.
通过在一维应力波理论建立的传导理论，分析了波在楔型表面的反射和透射现象。
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