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topsoil + verb
topsoil 在此为不可数名词，谓语动词用单数。
Topsoil contains most of a soil's nutrients.
表层土含有土壤中大部分养分。
表层土；上层土
先理解核心含义，再看它在真实句子里的用法。
表层土；上层土
topsoil
Topsoil contains most of a soil's nutrients.
表层土含有土壤中大部分养分。
表土(最肥沃、最适宜种植新植物的上层土壤)
The upper layer of soil, typically most fertile and in which it is the easiest to start new plants.
地表的土壤层
the layer of soil on the surface
The heavy rain washed away the topsoil from the hillside.
大雨冲走了山坡上的表层土。
Farmers need rich topsoil to grow healthy crops.
农民需要肥沃的表层土来种植健康的庄稼。
The construction project removed all the topsoil before building the foundation.
施工项目在建造地基之前清除了所有的表层土。
topsoil 在此为不可数名词，谓语动词用单数。
Topsoil contains most of a soil's nutrients.
表层土含有土壤中大部分养分。
表示“在表层土下面”时常用 under the topsoil，定冠词不可省略。
The bone was buried just under the topsoil.
那根骨头就埋在表层土下面。
表示数量时用“数量词 + of topsoil”，如 inches/feet of topsoil。
The site is covered with a few inches of topsoil.
这个场地被几英寸厚的表层土覆盖着。
Not this
We need to add a topsoil to the field.
Use this
We need to add a layer of topsoil to the field.
topsoil 通常作不可数名词，不能直接用 a topsoil 来表示“一层表层土”。表达数量时要加量词，例如 a layer of topsoil，或说 some topsoil。
Not this
Plants grow on topsoil.
Use this
Plants grow in topsoil.
表示“在土壤里生长”时，介词应用 in，因为植物的根扎在表层土里面，而不是在它的表面上。on topsoil 表示在土壤表面，不符合植物生长的语义。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
肥沃的表层土
The rich topsoil in this valley is perfect for growing vegetables.
这个山谷肥沃的表层土非常适合种植蔬菜。
一层表层土
The area was covered with a layer of topsoil before the seeds were sown.
播种前，这片区域被覆盖了一层表层土。
表层土侵蚀
Planting trees can help prevent topsoil erosion.
植树有助于防止表层土侵蚀。
剥离表层土
The miners stripped the topsoil to reach the coal beneath.
矿工们剥离表层土以开采下面的煤。
回填表层土
After the pipeline was laid, the workers replaced the topsoil.
管道铺设完成后，工人们回填了表层土。
铺设表层土
We spread topsoil over the new lawn to help the grass take root.
我们在新草坪上铺设了表层土以帮助草扎根。
Use topsoil naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把top（顶部）和soil（土壤）联想在一起：最上面的那层土，就是topsoil（表层土）。
语域：neutral 常见场景：gardening、agriculture、landscaping “topsoil” 是中性常用词，通常用于描述地表土壤，在园艺、农业和土地工程中比较常见；正式或非正式场合均可使用，没有明显的语域偏向。
这些以 -oil 结尾的词（boil、coil、foil、oil、soil、toil）与 topsoil 末尾的 /sɔɪl/ 押韵。注意不要被拼写误导：topsoil 与 topsail /ˈtɑpˌseɪl/ 拼写相近但发音不同；soil 也不要和 soul /soʊl/ 或 sole /soʊl/ 混淆。
Dictionary facts from ECDICT, WIKTIONARY.