perforation单词什么意思_perforation单词解释 perforation的反义词perforation的例句

名词穿孔; 贯穿; 针孔; 齿孔

1. 穿孔：3,穿孔(perforation) :约见于 5%的患者,最易发生于十二指肠溃疡. 4,出血(hemorrhage) :主要合并症,表现为潜血阳性或黑便,呕血等. 5,癌变(malignant transformation) :十二指肠溃疡一般不恶变,胃溃疡患者中发生癌变者 ≤1%. 四,

2. 射孔：在生产数据文件中,有个Event,它的措施除了有射孔(Perforation)以外,还包括其他的措施吗?这个文件中的Top和Bottom是垂深还是井深?其他的工程措施比如堵水、打塞、封隔器、酸化、压裂应该在那里处理,如何处理?

3. 齿孔：还在北京展出过. 许多人收集新票(mint),有人收集四方连(block of four),但是也有人专门收集信销票(used stamp),因为后者才能体现收集的乐趣. 当然,收集信销票要讲究品相(condition),连齿孔(perforation)都要注意完整.

4. 打孔：pelt生毛皮 | perforation打孔 | permanent compression test壓縮永久變形試驗

1. 小孔；小洞；（尤指）纸孔
Perforations are small holes that are made in something, especially in paper.

e.g. Tear off the form along the perforations and send it to Sales...
沿着纸孔撕下表格，寄给销售部。
e.g. When held to the light the small oblong leaves are seen to possess tiny perforations.
迎着光看时，就会发现椭圆形小叶子上有微小的孔眼。

noun

1. the act of punching a hole (especially a row of holes as for ease of separation)

2. a line of small holes for tearing at a particular place

3. a hole made in something

e.g. a perforation of the eardrum

\u0077\u0077\u0077\u002e\u0071\u0069\u0063\u0061\u0069\u002e\u006e\u0065\u0074