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There are many stories about military dogs who have saved soldiers’ lives.
军犬拯救士兵的故事有很多。
However, dogs are not the only animals that have been trained for war.
然而，狗并不是唯一被训练作战的动物。
Many naval forces around the world use sea animals to help them detect danger.
世界上许多海军部队利用海洋动物来帮助他们探查险情。
The first military experiments with sea animals began in 1960, when the U.S. navy started to train dolphins to find submarines and underwater mines.
1960年人们第一次尝试用海洋动物来辅助作战，当时美国海军开始训练海豚来寻找潜艇和水雷。
They chose dolphins because of their ability to use echolocation, which allows them to find objects in the dark.
他们选择海豚是因为它们有回声定位的能力，这使它们能够在黑暗中找到物体。
In 1965, the Soviet Union opened a research centre to train dolphin soldiers of their own.
1965年，苏联开设了一个研究中心，训练自己的海豚士兵。
Both the U.S. and Russia still train military dolphins today.
美国和俄罗斯至今仍在训练军用海豚。
However, in 2012, the U.S. navy announced that they would eventually replace their dolphins with underwater drones.
但在2012年，美国海军宣布他们终将用水下无人机取代军用海豚。
