心土[xīn tǔ]
{农} subsoil
1. subsoil：subsiding water 退水 | subsoil 心土 | subsoil water 底土水
2. 心土
2. under soil：undefined structure 无定型结构 | under soil 心土 | underclay 底粘土
3. deep soil：deep sea sand 深海砂 | deep soil 心土 | deep structures 深部构造
4. su oil：su istence farming 自给农业 | su oil 心土 | su oil plough 深耕犁