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.

youdao

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.

youdao