单词	perforation
释义	perforationper‧fo‧ra‧tion /ˌpɜːfəˈreɪʃən $ ˌpɜːr-/ noun formal Examples EXAMPLES FROM THE CORPUS An attempt to visualise the proximal bile ducts resulted in a small perforation. Complicated appendicitis was defined as appendicitis with histopathological evidence of perforation or gangrenous change. In no patient was there evidence of perforation, even in those in whom bile collections were found. One room could be filled entirely with keyboards, which operated by punching coded perforations on to a roll of paper ribbon. These curious drum-shaped clay objects characteristically have two perforations on one side and two or three stalks rising from the top. Today she is in Pennsylvania Hospital with perforation of her stomach. When the stereo sends audio signals to the electrodes in the speaker, sound comes out of the perforations. 1[countable usually plural] a small hole in something, especially one of a line of holes made in a piece of paper so that it can be torn easily:  the perforations in a sheet of stamps2[uncountable] when something makes a hole or holes
随便看	derogate derogatory derrick derring-do derrière Derry dervish desalinate desalination descale descant Descartes, René descend descendant descent describe description descriptive descriptively Desdemona desecrate desecration desegregate desegregation deselect

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