本集内容. Dogs were man's best friend far earlier than thought. 狗成为人类 “最佳伙伴” 的时间远早于早前认知. 文字稿. It's a small piece of jawbone, bu ...

Discovering the code of all life 探寻地球所有生命的密码 Episode 191212 / 12 Dec 2019 Learn English words and phrases from this story ...