heavy medium

例句：

1. 1.The heavy medium is suitable for processing materials with high viscosity.
   这种重质材料适用于处理高粘度的材料。
2. 2.The medium heaviness of the soil allows for good drainage.
   土壤的适中重量有利于良好的排水。
3. 3. The heavy medium was used to separate the oil from the water.
   使用重质介质将油从水中分离出来。