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硬土层 yìngtǔcéng
eng.geol. ironpan
hydroel.st. pan
met. hardpan
tech. firm soil stratum; iron pan; panformation; bedrock; firm ground
硬土层通常指在地表几英尺以下的大石块、黏土或砾石层,且很紧密的胶结在一起，在掘进之前必须将它爆破或剥开 yìngtǔcéng
expl. hardpan
硬土层a yìngtǔcéng
tech. pan a
硬 土层
: 16 phrases in 7 subjects
Bridge construction1
Desert science4
Drilling1
Engineering geology2
General1
Oil / petroleum2
Technology5

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