| 词汇 | Portland beds |
| 释义 | Definition of Portland beds in English:Portland bedsnoun Geology
OriginEarly 19th century; earliest use found in Thomas Webster (1772–1844), geologist. Definition of Portland beds in US English:Portland bedsnoun Geology
OriginEarly 19th century; earliest use found in Thomas Webster (1772–1844), geologist. |
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