| 单词 | 砂砾层 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔apron〕An area covered by sand and gravel deposited at the front of a glacial moraine.冰川前砂砾层：冰河冰渍前沉积的沙及砾石覆盖的区域美国传统〔pay dirt〕Earth, ore, or gravel that is profitable to mine.可采矿石：有开采价值的土层、矿石或砂砾层美国传统 |
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