There is no graded gravel bed to buy, transport, handle at the job site, and install.

没有分级砾石床的购买、运输、工作现场的处理和安装等问题。

youdao

There is no graded gravel bed to buy, transport, handle at the job site, and install.

没有分级砾石床的购买、运输、工作现场的处理和安装等问题。

youdao