短語詞組短語clay central core 粘土心墻clay impervious core 粘土防滲墻clay -core gravel sand dam 砂礫石粘土心墻壩clay central core embankment dam 粘土心墻土石壩inclined clay -core wall 粘土斜墻clay sloping core roch -fill dam 粘土斜心墻堆石壩clay core wall 粘土心墻 返回 clay core