The image of a dorsal fin cutting through the sea surface is iconic.

背鳍划破海面是种标志性画面。

Yet overfishing and the cruel practice of finning, cutting off shark fins to make exotic soups and returning the wounded creature to the sea to die, are threatening shark numbers.

然而，过度捕捞和割鳍的残忍做法，——割下鲨鱼鳍来做异国风情的汤，然后把受伤的鲨鱼放回大海——正威胁着鲨鱼的数量。