短语词组短語soft substratum soil replacement 軟弱下臥層換土soft -soil reinforcement 軟基加固soft muddy soil 淤泥質軟土soft foundation soil 軟弱地基sullage soft -soil 淤泥質軟土soft clayey soil 軟粘土地基saturated soft clay soil 飽和軟粘土soft cohesive soil 軟黏性土 返回 soft soil