Synthetic Soil Matrix

EPA 的标准是怎样规定的？也可说说natural soils

Synthetic diamonds date to: soil pipe是什么？ soil和rob zombie what is soil organic materials? 帮忙翻译reinforcement：Synthetic cord with wire 是什么意思？ 请问这两个词是什么意思啊?Synthetic Darkness 帮我系统介绍一下Soil earth,soil,land,ground有什么区别? soil"土壤"是否可数 land,floor,ground,earth,farmland,soil,field有什么区别