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Peyton has chosen piranhas as symbols for the 2012 presidential race .

佩顿选用食人鱼来象征美国2012年的总统大选。

The researchers are now interested in whether piranhas vocalize during mating .

研究人员现在研究，食人鱼在交配时是否发声。

Found in south american rivers and the pantanal marshlands , snakes and piranhas are among its preferred food .

发现于南美河流和潘塔纳沼泽地，蛇和食人鱼位列其首选食物。

Due to the aggressive nature of piranhas , another key concern is the destruction of other fish populations .

由于食人鲳的攻击本性，外界关心的另一个关键问题就是其它鱼类数量可能遭到破坏。

Piranhas occasionally bite humans or other mammals when very hungry or threatened , but serious attacks are extremely rare .

但在饥饿或者受到威胁时，食人鱼偶尔会攻击人类或其他哺乳动物，但很少出现严重袭击事件。