caudal fin

US /ˈkɔːdəl fɪn/
UK /ˈkɔːdəl fɪn/
"caudal fin" picture
1.

尾鰭

the tail fin of a fish or other aquatic vertebrate

:
The shark's powerful caudal fin propelled it through the water.
鯊魚強有力的尾鰭推動它在水中前進。
Fish use their caudal fin for propulsion and steering.
魚類利用它們的尾鰭進行推進和轉向。