| 单词 | lower layer |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔baseburner〕A coal stove with a hopper that automatically replenishes itself from above as lower layers of fuel are consumed.底燃火炉，自动填煤火炉：一种带有漏斗的煤炉，当下层燃料燃尽时，它会自动地从上面补充美国传统〔sima〕The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.硅镁层：地球外壳的较低层，在硅铅层之下，富含硅、铁和镁美国传统 |
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