What's more, China is working on the new high speed trains with the highest speed of 400km/h.

更重要的是，中国正在研制最高时速400公里的新型高速列车。

youdao

What's more, China is working on the new high speed trains with the highest speed of 400km/h.

更重要的是，中国正在研制最高时速400公里的新型高速列车。

youdao