直立，末端向前，首尾连接。
鳐鱼科，包括黄貂鱼和灰鳐，通过击打鳍的末端向前游动。
Fish of the family Rajidae, which includes stingrays and skate, swim by flicking the outer edges of their fins.
鳐鱼科，包括黄貂鱼和灰鳐，通过击打鳍的末端向前游动。
Fish of the family Rajidae, which includes stingrays and skate, swim by flicking the outer edges...
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.
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.
应用推荐