短语词组短語groundsill reinforcing 地基加固elastic groundsill 彈性地基soft groundsill 軟土地基infirm groundsill 弱地基groundsill stiffness 地基剛度groundsill subsidence 地基沉陷weak groundsill 軟弱地基上complex groundsill 複郃地基 返回 groundsill