细石混凝土硬基层面上 40mm的翻译：Fine stone concrete hard base surface 40mm 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Primary fine aggregate concrete hard surface 40mm

Fine stone concrete hard base surface 40mm

On thin stone concrete hard basic unit surface 40mm

fine stone concrete hard grass-roots at 40 mm

Fine stone concrete hard base surface 40mm