The logograms were incised on damp clay tablets with a stylus with a wedge shape at its end.
这些标识是用一根末端为楔形的手写笔在潮湿的泥板上刻下的。
2
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.