Scientists at Loughborough University believe they have created the world's smallest violin using nanotechnology. 拉夫堡大学的科学家们认为他们用纳米技术制造出了世界上最小的小提琴。 The violin is smaller than a human hair which is ...

本集内容. Updating London's Victorian sewage system 升级改造伦敦维多利亚时代的排水系统. 文字稿. This is London, but it's a story repeated across the ...