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起始时间 03:44

plastic bags and rubbish which has been thrown into the sea but this is a problem happening not just for the

The Dolphin | Educational Video for Kids.

YouTubeHappy Learning English

起始时间 01:56

use echolocation to locate their prey echolocation is a process where Dolphins emit high frequency clicks and

What's Special About Dolphin Fish? | important information about dolphin F…

YouTubeWS Craft Gallery

起始时间 00:36

absolutely nothing just standing there there's a dolphin to dolphins they're definitely surfacing

Dolphins Help Fishermen Catch Fish

YouTubeAnimal Planet

起始时间 04:09

each pot of dolphins has a unique hierarchy which is a system of organization based on status

Dolphins for Kids | Learn all about this super smart animal

YouTubeLearn Bright