英语翻译

问题描述:

英语翻译
drain as described cast in 600mm length bedded and jointed in cement mortar laid to fall with 100mm mass concrete (grade 20-20mm aggregate) as described base including all necessary ends
只求翻译者一句,很多专业术语我搞不懂

流失是在600毫米长度描述铸层状和贴合在水泥砂浆铺设下降与100毫米大体积混凝土(年级20-20mm骨料)所描述的基础包括所有必要的结束