| 单词 | upper layer |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔lowering〕The upper layer of felt should overlap the lower.毛毡的上层应与下层重叠。柯林斯高阶〔sial〕Rock rich in silicon and aluminum forming the upper layer of the earth's crust beneath all continental landmasses.硅铝带，硅铝层：由富含硅和铝的岩石组成的所有大陆块下面的最外层地壳美国传统〔solum〕The upper layers of a soil profile in which topsoil formation occurs.土层：一块土地纵断图中上面的几层，表土就形成于其中美国传统 |
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