What if cracks in concrete could fix themselves? - Congrui Jin
级别 B2 · 34 句 · 4:39 · TED-Ed
逐句听 What if cracks in concrete could fix themselves? - Congrui Jin，输入你听到的内容，每个词都会得到批改。
级别 B2 · 34 句 · 4:39 · TED-Ed
逐句听 What if cracks in concrete could fix themselves? - Congrui Jin，输入你听到的内容，每个词都会得到批改。