n.表土，表土层

The gardener added a layer of topsoil to enrich the existing soil.
园丁添加了一层表土来丰富现有的土壤。
We need to spread topsoil evenly across the lawn to ensure healthy grass growth.
我们需要将表土均匀地铺在草坪上，以确保草的健康生长。
After removing the weeds, we'll mix compost with the topsoil for better nutrient content.
清除杂草后，我们将堆肥与表土混合，以提高养分含量。
The farmer used a plow to turn over the topsoil, preparing it for planting.
农民用犁翻动表土，为种植做准备。
Topsoil depth is crucial for plant root development; it should be at least six inches deep.
表土的深度对植物根系发育至关重要，至少应有六英寸深。
The construction site required several truckloads of topsoil for landscaping purposes.
建筑工地为了景观美化需要好几卡车的表土。
Adding topsoil can help improve soil structure and increase its water-holding capacity.
添加表土有助于改善土壤结构并增加其保水能力。
The erosion control team applied mulch over the topsoil to prevent washout during heavy rains.
水土保持团队在表土上覆盖了护根物，以防大雨时的冲刷。
It's important to test the pH level of the topsoil before planting any vegetation.
在种植任何植被之前，测试表土的pH值是很重要的。
The garden center sells different grades of topsoil, suitable for various types of plants.
花园中心出售不同等级的表土，适合各种类型的植物。