😊 这个 news really impressed me, China's technological innovation is so powerful! 🤯 3.5 million-ton-level freight train group trial is a big breakthrough in the world, and I think it's because of our country's continuous investment in research and development 💡。我觉得这项技术的应用将大大提升我们的货运能力,减少了人为错误的可能...