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ironpan | |||
pan | |||
hardpan | |||
firm soil stratum; iron pan; panformation; bedrock; firm ground | |||
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hardpan | |||
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pan a |
硬 土层 : 16 phrases in 7 subjects |
Bridge construction | 1 |
Desert science | 4 |
Drilling | 1 |
Engineering geology | 2 |
General | 1 |
Oil / petroleum | 2 |
Technology | 5 |