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BNC: 34034 COCA: 25236

protrusion

noun
/prəˈtruːʒn/
/prəʊˈtruːʒn/
[countable, uncountable] (formal)
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  1. a thing that sticks out from a place or surface; the fact of doing this突出物;凸起;伸出
    • a protrusion on the rock face岩石表面的突起部分
    Word Originearly 17th cent. (in the sense ‘thrust something forward or onward’): from Latin protrudere, from pro- ‘forward, out’ + trudere ‘to thrust’.

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