The next day I bought a pair of swim fins and I have been skin diving ever since.

我第二天买了一橡皮脚蹼，自此从事切肤潜水。

youdao

He invented swim fins for his feet and hands because he wanted to move faster in the water.

他因为要在水中游得更快，为自己的手脚发明了脚蹼。

youdao

From upstream to downstream, to go to, have no a propeller, without losing tracing the swim fins, ability, we can not return in the past.

从上游来，往下游去，没有桨，没有鳍，失去溯游的能力，我们回不到从前。

youdao

Without their fins, sharks cannot swim and they sink to the ocean floor, where they're picked at by other fish and left to die.

CNN: Shark fin soup alters an ecosystem