月亮词典
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mineral veins
矿脉
常用释义
词性释义
矿脉
例句
全部
When
the
mineral
veins
are
buried
deep
in
the earth
,
it
is
necessary
to
excavate
shafts
and tunnels to reach the
ore body
.
如果矿脉在地下埋藏较深，就必须挖掘井巷以通达矿体。