below the topsoil of the earth is the subsoil,a layer that c
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layer,岩层,是可数的,所以前面用a layer 表示一级岩层.

a layer 跟 the subsoil是同位语关系,that contains stones mixed withorganic matter整句话是that引导的定语从句修饰a layer.that是定语从句的关系代词,在从句中指代先行词a layer.

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