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| 地面线 | |||
| 地坪 | |||
| 基准面; 地平 | |||
| 底面 | |||
| 坡度水平斜坡面所在水平，亦指露天矿的底板标高 | |||
| 基准高程 | |||
| 平整后地坪高程; 地坪高程 | |||
| English thesaurus | |||
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| GL | |||
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Grade Level : 20 phrases in 7 subjects |
| Bridge construction | 1 |
| Communications | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 2 |
| Law | 1 |
| Rail transport | 1 |
| Technology | 12 |