perforation [pə:fə'reiʃ(ə)n]

perforation的基本解释

n.

穿孔, 贯穿, 贯通

与perforation相关的网络例句 [注：此内容来源于网络，仅供参考]

The tracheary elements in secondary xylems of Actaea asiatica root and rhizomes were observered with a scanning electron microscope and found to contain abundant types, which mainly included tracheids, tracheid-like vessels, fibriform vessels, and typical vessels. Of these types, the tracheids, tracheid-like vessels, fibriform vessels were first found. Scalariform perforation plates, reticulate perforation plates, mixed perforation plates and simple perforation plates were observed in the typical vessels and the reticulate perforation plates ,mixed perforation plates were first founded the lateral-wall perforation plates, multiple end walls and pit membrane vestige were also observed in the tracheary elements.

利用扫描电子显微镜对毛茛科类叶升麻根和根状茎次生木质部中的管状分子进行观察，发现其管状分子类型丰富，主要有：管胞、管胞状导管、纤维导管和典型的导管分子，其中管胞、管胞状导管和纤维导管为在该类群中首次报道；在导管分子中，存在着梯状穿孔板、网状穿孔板、混合型穿孔板和单穿孔板，其中网状穿孔板和混合型穿孔板为在该类群中的首次报道；对其导管分子上的侧壁穿孔板、多穿孔板和纹孔膜残余也进行了描述。

Emblica have many different forms and most of them have tails and their perforation plates divide into two types:(1)there is one simple perforation plate at each end of the vessel elements and (2) there is one simple perforation plate at one end of the vessel elements and two simple perforation plate at the other end;(3)a few vessel elements have special inclusions;(4)the intervascular pits are alternate pits;(5)the pits between the vessels and rays are mixed pits ,pits with transverse gashes and scalariform pits.

结果发现，余甘子次生木质部导管分子中存在着许多不同的样式，导管分子大多数具尾；其穿孔板存在着两种类型：(1)两端均为1个单穿孔板；(2)一端为1个单穿孔板；另一端为2个单穿孔板；(3)极少数的导管分子具有特殊的内含物；(4)管间纹孔式为互列纹孔式；(5)导管射线间纹孔式为混合型纹孔与横列刻痕状纹孔以及梯状穿孔。

Under the scanning electron microscope , for the first time we compare and study both the coalified tracheids through chemical maceration and permineralized tracheid lumen casts. This method reveals the microstructures of wall and perforations of G-type tracheids: 1 The lignified layer of secondary wall is composed of uneven material and further divided into S〓, S〓, S〓 layers; with the smooth enclosing wall, the perforation is internally dumbbell-shaped; 2 In Huia gracilis, the enclosing wall of tracheidal perforation contracts and possesses secondary perforations. The perforation has thickened border facing the tracheid lumen.

本文首次在扫描电子显微镜下对比研究经化学浸解获得的碳质管胞和矿化的管胞腔铸体，明确揭示出了G-型管胞壁层和穿孔的显微结构：1）Hsüa reflexa次生壁木质化层的组成不均一，分为S〓、S〓和S〓层；穿孔腔为哑铃形，腔壁光滑；2）Huia gracilis的穿孔腔收缩，腔壁上发育次级穿孔，孔口具有边缘加厚。

与perforation相关的网络解释 [注：此内容来源于网络，仅供参考]

perforation：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,

perforation：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?

perforation：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.

perforation：打孔

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

gastric perforation：胃穿孔

新生儿胃穿孔(gastric perforation)多由先天性发育缺陷,胃壁肌层薄弱或缺损所致.临床上是种少见病.多发生于早产儿或低体重儿.