Add a propeller and a tail fin and it looks exactly like a little plane.
装上螺旋桨和尾翼之后，看起来极像小飞机。
The movement of a fish's tail fin helps propel a fish through the water.
流动的一条鱼的尾鳍有助于推动鱼在水中。
The aircraft has a long tail fin.
那架飞机有一个长长的尾翼。
Its tail has a top fin that is much larger than the lower fin.
尾巴上面的鳍比下面的鳍大得多。
Its tail has a top fin that is much larger than the lower fin.
尾巴上面的鳍比下面的鳍大得多。
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