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单词 gull
释义
gull

Science and Technology
  • A medium-sized to large seabird (family Laridae), usually grey or white, some with black on the head and wings. The wings are long and pointed and the feet webbed. Gulls nest in dense colonies. Most are opportunistic, carnivorous, and scavengers. There are ten genera with at least 54 species, distributed worldwide.

    Mike Allaby


Geology and Earth Sciences
  • A tension fracture that develops when a competent rock that overlies incompetent material experiences extension due to gravitational sliding along the bedding, widening joints. Surface material often fills gulls. Small-scale cambering often causes gulling behind cliff tops where blocks have toppled over the edge, producing gulls that are wide at the top and narrow at the bottom.

    http://www.ubss.org.uk/resources/proceedings/vol17/UBSS_Proc_17_2_153-174.pdf Describes two gull caves from the Wiltshire and Avon border.


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