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hardground
n
gen.
硬底
质
;
硬土
;
岩底
;
无沉积层的
坚实地基
hardground
v
geol.
硬底
;
基岩底
oil
不整合面
;
硬灰岩层
hardground
:
1 phrase
in 1 subject
Desert science
1
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