However, the construction technology of ballast less track still lacked mature experience.

但是，我国铁路在无砟轨道施工技术方面尚缺乏成熟经验。

youdao

However, the construction technology of ballast less track still lacked mature experience.

但是，我国铁路在无砟轨道施工技术方面尚缺乏成熟经验。

youdao