dust mulch

例句：

1. 1.The farmer used a broom to dust the ground before planting.
   农民用扫帚在播种前清扫地面。
2. 2. The gardener applied a layer of dust mulch to protect the plants from weeds.
   园丁在植物上撒了一层土覆盖物，以保护植物免受杂草侵害。
3. 3. The old tree was covered in dust mulch, making it look like it had been there for centuries.
   这棵老树被尘土覆盖物覆盖，看起来已经有几百年的历史了。