| 词汇 | perforation |
| 释义 | perforation noun uk /ˌpɜː.fərˈeɪ.ʃən/ us /ˈpɝː.fəˈreɪ.ʃən/ [ C ] a hole in something: 孔 A tea bag is full of tiny perforations.茶包上满是小孔。 [ C or U ] medical specialized a hole that goes all the way through a membrane or tissue or the act of making a hole like this: 穿透膜（或组织的）孔;在膜（或组织）上穿的孔 One possible complication of colonoscopy is a perforation through the bowel wall that could require surgery.结肠镜检查的一个可能的并发症是大肠穿孔，必须靠手术解决。 Holes, hollows and dips anti-crack aperture blistered chink cranny cratering gauge gouge hollow interstice leak leaky micropore microporosity microporous piercing pinprick shaft thumbhole void Examples of perforationperforation Perforation or damage to adjunct structures is also unlikely, and did not occur during our existing experience. Off the perforation centreline, however, the boundary layer profiles are highly distorted. The perforations consisted of eight 1 in. holes randomly arranged. The samples obtained were studied histologically and the lungs examined with 1 cm serial sections for evidence of serious hemorrhage, contusion or pleural perforation. The exploration and empirical quantification of light levels for at least three threshold conditions was performed by adjusting the perforation. Numerous small perforations occurred posteriorly but fewer anteriorly. We then examine the absorptive properties of this arrangement when the perforations are circular apertures. Three 1-cm2 perforations were made on each side of the litterbags to allow macro-fauna to enter. There is a need for a theory to determine the optimal combination of the perforation geometry and the bias flow. However, 30% of stents occlude or migrate, and they can also cause bleeding or perforation. Comparisons are now made between the predictions and measurements for isolated holes and single rows of super-scale perforations. There were no deaths, pulmonary artery perforations or acute aneurysm formations. As it progresses downstream of the perforation the vortex diffuses and its core migrates away from the surface. When excising this region, it is important to remember that extensive resection can lead to perforation of the heart wall. Three suction perforations were located on the upper surface 450 mm from the leading edge. See all examples of perforation These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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