However, no systematic and complete monographs about construction techniques are ever seen.

然而迄今为止，尚未见有较系统完整的箱式隧道施工技术专著。

youdao

However, no systematic and complete monographs about construction techniques are ever seen.

然而迄今为止，尚未见有较系统完整的箱式隧道施工技术专著。

youdao