Why don't perpetual motion machines ever work? - Netta Schramm
级别 B2 · 43 句 · 5:31 · TED-Ed
逐句听 Why don't perpetual motion machines ever work? - Netta Schramm，输入你听到的内容，每个词都会得到批改。
级别 B2 · 43 句 · 5:31 · TED-Ed
逐句听 Why don't perpetual motion machines ever work? - Netta Schramm，输入你听到的内容，每个词都会得到批改。