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protuberance; projection; prominence; protrusion; bump; boss; process; apophysis
この部品の突起が引っかかって外せない。
The protrusion on this part is catching and I can't remove it.
突起に指が引っかかった。
My finger caught on the protrusion.
突起の形状を測定して記録した。
I measured and recorded the shape of the protrusion.