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不易坍塌
| 地层
| 不易坍塌 | |
| bridg.constr. | un-easy caving |
| 地层 | |
| bridg.constr. | stratum; foundation; horizon |
| desert. | earth layers |
| geol. | bed |
| hydroel.st. | stratum; terrain; formation |
| nucl.pow. | stratigraphy |
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| un-easy caving | |||
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不易坍塌 : 2 phrases in 2 subjects |
| Engineering geology | 1 |
| Oil / petroleum | 1 |
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