班里正在进行“视力训练”。
一队军人正在进行视力训练。长官要求一个聪明的新兵数一下远方有多少人在挖坑。
The squad were having "visual training". One smart recruit was asked by the officer to count how many men composed a digging party in a distant field.
它们的视力比人类好，而且经过训练，能够辨认出在海上的失踪者穿着的橙色救生衣。
They have better eyesight than human and have been trained to spot orange life jackets of people lost at sea.
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