fin [fɪn]

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n.鳍；(飞机的)安定翼

a thin vertical part sticking out of the body of especially a fish or an aircraft which helps balance and movement

They swim using a small fin on their back. 它们用背上的小鳍游动。
The aircraft has a long tail fin. 那架飞机有一个长长的尾翼。