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 ...

Learn English words and phrases from this story 5,000-year-old human bone found in the River Thames 英泰晤士河发现五千年前人类骨骼 Episode ...