butterfly tail

基本解釋

The butterfly kick is also known as the dolphin kick since it is similar to the movement of a dolphin tail.
蝶泳的打腿還有一個常見的俗名，即海豚踢。這是因為這種打腿方式和海豚尾巴的運動方式非常相似。
xmyx.org
As I opened the garage door, I startled a large moth, which, upon spreading it's wings, displayed a bright red "tail" hidden by the motley brown wings, more a "butterfly" than a moth.
當我打開車庫大門的時候，我驚起了一只大飛蛾。當它伸展開翅膀時，可以看到一條鮮紅色的“尾巴”隱藏在它那斑雜的棕色翅膀上。