And it is also of vital importance to improve the comfortableness of riding trains while raising its speed.

而如何在提速同时提高列车乘坐舒适性也是提高铁路服务质量非常关键的因素之一。

youdao

And it is also of vital importance to improve the comfortableness of riding trains while raising its speed.

而如何在提速同时提高列车乘坐舒适性也是提高铁路服务质量非常关键的因素之一。

youdao