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 Universe’s best kept secrets 水下望远镜探索宇宙奥秘 Episode 210325 / 25 Mar 2021 Learn English words and phrases from ...