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Topsoil
表土
Humans need air, food, sunlight and water to survive.
人类离不开空气、食物、阳光和水。
How about plants?
那植物呢？
They also need air, food, sunlight and water.
它们同样离不开空气、食物、阳光和水。
Do they eat the same food humans eat? No, they don't.
它们吃人类吃的食物吗？不，它们不吃。
Their food is topsoil.
它们的食物是表土。
Topsoil is the upper part of soil.
表土是土壤上面的部分。
The depth of topsoil is usually up to 20 centimeters.
表土深度一般可达20厘米。
There are a lot of nutrients for plants and vegetables.
它里面有很多树木和蔬菜需要的养分。
Without topsoil you cannot grow trees or vegetables.
没有表土你就种不了树木和蔬菜。
There are many plants in jungles.
丛林中有很多植物。
Because the depth of topsoil in jungles is very deep.
因为丛林中的表土层很厚。
Are there any animals which need topsoil to live?
有靠表土生存的动物吗？
Yes, earthworms eat topsoil too.
当然有！蚯蚓也吃表土。
