perforations

perforations的基本解释

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齿孔

与perforations相关的网络例句 [注：此内容来源于网络，仅供参考]

The authors used a database of Medicare beneficiaries aged 65 years and older to identify individuals who were cancer-free and who had undergone at least one colonoscopy or sigmoidoscopy between 1991 and 1998, and they then calculated the incidence and risk of perforation within seven days of the procedure.During 39,286 colonoscopies, there were 77 perforations, or 1.96 perforations per 1,000 procedures, compared with 31 perforations during 35,298 sigmoidoscopies, or 0.88 perforations per 1,000 procedures.

结果显示，在39，286位做大肠镜筛检的民众之中，有77位发生肠穿孔。35，298 位做直肠镜筛检的民众，有31位发生肠穿孔，也就是说，做大肠镜筛检者，每1，000位就有1.96位可能发生肠穿孔，而直肠镜筛检的肠穿孔发生率则为每1，000位中有0.88位。

The anatomical study deepens the knowledge of G-type conducting cells: 1 It proves the theory of two depositional process for secondary wall (Bierhorst, 1960): the discontinuous cellulose layer is laid down before the continuous lignified layer; the former layer is prone to be broken down, while the latter is highly decay-resistant; 2 It suggests that the cellulose primary and secondary walls of tracheids are not perforated. Instead of longitudinal pits (Li, 1992), the lignified tracheid secondary wall of Hsüa possesses irregular simple perforations; 3 In Hsüa reflexa and Huia gracilis, the perforation casts may represent the thickness of lignified secondary wall; 4 The wall structure of G-type tracheid is diversified. At the genus level, the secondary wall structure differs in the distribution, internal shape and structure of the perforations; 5 Perforations of some G-type tracheids combine the characters of S-type tracheids in their distribution, density and diameter.

解剖学的研究加深了对G-型输水管胞的认识 1）验证了管胞次生壁分两个阶段形成的理论（Bierhorst，1960），即先后形成不连续的纤维质层和连续的木质化层，前者易被分解，后者抗侵蚀性强；2）证明管胞纤维质的初生壁和次生壁不具穿孔，Hsüa管胞的木质化次生壁具有不规则的简单穿孔，而不是纵列的纹孔（Li，1992）；3）Hsüa reflexa和Huia gracilis的穿孔铸体可代表木质化次生壁的厚度；4）G-型管胞壁层结构具多样性，植物属一级的分异主要表现在次生壁穿孔的分布、孔腔形状和结构的不同；5）某些G-型管胞的穿孔在其分布、密度和孔径方面可兼有S-型管胞的特征。

Deep research and comparison show that, besides the centrarch xylem, H. reflexa has G-type tracheids. Upon and between the annular secondary thickenings, the lignified layer of secondary cell wall bears irregular simple perforations of small diameter and high density. So these perforations have the characters of S-type tracheids. The robust xylem strand and dense perforations indicate the strengthened water-conducting capacity.

深入的研究和比较表明H.reflexa的木质部除为心始式外，管胞为G-型，次生壁的木质化层具有不规则的简单穿孔，穿孔直径小，密度大，分布在环纹次生加厚带和其间，兼有S-型管胞穿孔的特征；粗壮的木质部束和密集的穿孔表明较强的输导能力。

与perforations相关的网络解释 [注：此内容来源于网络，仅供参考]

perforations：齿孔

perforation /穿孔/贯穿/贯通/ | perforations /齿孔/ | perforative /穿孔的/贯穿的/有穿孔力的/

perforations adding：补孔

perforation-flow efficiency 射孔流动效率 | perforations adding 补孔 | perforator cable 射孔器电缆

perforations of pulp floor：髓室底穿通

煤层底板:floor of coal seam | 髓室底穿通:perforations of pulp floor | 底板破坏深度:depth of destroyed floor

Commingled with Delayed Perforations：与后来射开层合采

Commingled 合采 | Commingled with Delayed Perforations 与后来射开层合采 | Crossflow 窜流

suction couch with cellular perforations：蜂巢式真空伏辊

suction couch with cellular gratings 缝隙式真空伏辊 | suction couch with cellular perforations 蜂巢式真空伏辊 | suction couch with open chamber 敞开式真空伏辊