fine surface mulch of gravel

例句：

1. 1. The gardener uses a fine surface mulch to help the plants grow better.
   园丁使用细粒表面覆盖物来帮助植物生长得更好。
2. 2.The soil is rich in organic matter and needs a fine surface mulch to prevent weeds from growing.
   土壤富含有机物质，需要细粒表面覆盖物以防止杂草生长。
3. 3. The farmer applied a fine surface mulch to protect the crops from harsh weather conditions.
   农民在作物上施加了细粒表面覆盖物，以保护作物免受恶劣天气条件的影响。