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单词 opal dirt
释义

opal dirt

noun [mass noun] Australian
The type of soil in which opals are found: mechanization means the opal dirt can be removed in bulk...
  • Down the slope towards Lightning Ridge, the depth to opal dirt was 65 feet.
  • The opal dirt is much harder than on the rest of the field.
  • The mine is lighted by electricity and a power plant inside takes opal dirt back to the surface.
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更新时间:2024/12/25 14:01:36