a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
the flat broad limb of aquatic animals specialized for swimming
例句
用作名词 (n.)
It had 4 flippers that looked like paddles. 它的四个鳍状肢看起来就像划桨一样。
A bizarre creature whose body was dwarfed by its long, thin neck and tail, Elasmosaurus swam using four flippers. 薄片龙是一种样子古怪的蛇颈龙,活像长着超长脖子的侏儒一般,靠四个鳍状肢游动。