短語(yǔ)詞組短語(yǔ)gravel -filled 填礫gravel filled filter 填礫過(guò)濾器gravel filled layer 填礫層gravel filled trench 礫石填槽filled gravel 填礫filled gravel filter 填礫過(guò)濾器non -filled gravel filter 非填礫過(guò)濾器 返回 gravel fill