向下的

The results are listed as follows:(1) In peneplain with plenty water-resource, hexagonal spatial structure of urban system can be formed. Due to differential competed function of central places, the hexagonal system is distorted. The result is that the area covered is decr eased and the girth is unchanged——but every border is usually unequal;(2) A pattern of pentagonal system evolves from hexagonal system controlled by a river;(3) A pattern of quadrilateral develops from hexagonal system under two parallel rivers;(4) The equal distance distribution of central places in narrow geographic space has its special reasons. The results are very important for understanding urban's formation and development and urban plan in Huang-Huai-Hai plain.

本文通过自然地理因素中水文、地形这两个重要要素对城镇体系空间结构形成的影响，分析了华北平原区在不同要素影响下的城镇体系空间结构样式：①在水源充足的准"均质"河北冲积平原上，基本满足六边形形成条件，但由于周边中心地发展竞争力不同，故使得正六边形发生畸变——覆盖面积减小而周长却保持不变；②构建了在一条河流影响下的六边形网络结构朝五边形网络演变的模型；③构建了在平行状河流作用下六边形网络向四边形网络演替的模式；④指出了在水源充足的狭长地理空间，城镇体系空间结构发育成等间距的现象与原因。

Three minutes later, it spiraled nose-first into the Rockaway Beach section of Queens - a middle-class neighborhood, 15 miles from Manhattan.

这里"spiral nose-first"很形象地描绘出当时飞机头朝下，盘旋坠落的情景。Spiral的意思是"盘旋向下"，nose-first顾名思义就是"鼻子在前"了。

Properties of nonlinear buckling deformation of round soleplate with slot structure under concentrated load are studied.

运用MSC.Nastran求解器计算了薄壁圆柱壳在轴向压力作用下的临界载荷、屈曲模态及薄底板在集中载荷作用下的非线性屈曲问题。

As the sun was going down to the sea you made your way down to the valley and everything around you was alight, that blade of grass, that sumac , the towering eucalyptus and the flowering earth.

当太阳落向大海，你开始向下往山谷走去，你周围的一切都被点亮了，草的叶片，漆树，高大的桉树，和开满鲜花的土地。

In this paper, the fundamental problems of the dynamic buckling in cylindrical shells are axial impact, torsion impact and coupling impact. The dual variables in symplectic space are gotten from energy function, and the Hamiltonian system is established.

本文针对弹性圆柱壳在轴向冲击、扭转冲击、轴扭耦合冲击及径向均布压力和轴向冲击载荷耦合作用下的动态屈曲问题，借助于系统的能量构造出问题的原变量和对偶变量，建立了系统的哈密顿体系。

Canards also make it very difficult to apply flaps: normally, extending flaps causes a downward movement of the nose, which is compensated by the tailplane.

鸭翼也很难做成可动式的：正常情况下，多余的翼动会使机鼻产生向下运动，这尾翼上获得了抵消。

Then the cultivated chondrocytes were embedded in fibrin glue fused on spongy bone, covered with priosteal flap; the complex was used to repair the femoral trochlea osteochondral defect which size is 3mm × 4mm × 4mm made in rabbit knee joint.

在A组的每只兔子的一侧膝关节股骨滑车部人为造成3mm×4mm的骨软骨缺损，骨刀切除软骨下骨到髓腔渗血为止(厚约4mm)，压迫后FG止血；取髂骨骨块，并尽可能保留松质骨，取下的骨块用PBS反复清洗，以除去血细胞，将松质骨填充在骨缺损处，松质骨面朝向关节腔，高度与周边软骨下骨齐平，把骨膜片生发层朝向关节腔，用无创伤缝合线缝合在周边的软骨或滑膜组织上；向EP管中加入1/2悬液体积的FG主体胶溶液并混匀，再与主体胶等体积的催化剂溶液一同注射入骨膜与骨块密闭的腔隙中；同理处理另一侧膝关节。B组处理与A组相比只是不加入软骨细胞；C组造成骨软骨缺损，FG覆盖创面后单纯用骨膜修复缺损。

Abstract］ objective to improve the diagnosis of non-ossifying fiboma by analysing its x-ray feature.methods plain x-ray films was performed in all patients.x-ray finding in 8 cases with pathologically-confirmed non-ossifying were analyzed.results the clinical symptom was mild,the lesions occurred usually at the metaphysis of the long bones,the affected bones included femur（n=4）,tibia（n=3）,humerus（n=1）.cortical type was seen in 5 cases,presenting as unilocular or multilacular transparent areas with in the cortex or tightly beneath the cortex,the lesion had a sclerotic margin.which was more obvious at the marrow side.medullary type was seen in 2 cases.the lesion was located at the center of the bone and grew centrally.the tumor was manifested as unilocular or multilocular.tramsparent area with sclerotic border and the bone cortex became thinner with slightly expanding on 11 sides.conclusion plain radiography is the elementally means to detect this disease.based on the typical x-ray signs of non-ossifying fibroma combined with clinical data,correct preoperative diagnosis can be made in most cases.

目的 探讨非骨化性纤维瘤的x线表现以提高诊断水平。方法所有病例均摄有x线平片，分析经病理证实的8例非骨化性纤维瘤。结果临床症状轻，好发于下肢长骨干骺端或骨干，股骨4例，胫骨3例，肱骨1例。皮质型5例，表现为皮质内或紧贴皮质下的单层或多层透亮区，病变向骨内发展进入髓腔，周围有致密硬化带环绕，以髓腔侧明显；髓质型2例，病灶在骨内中央发展，显示为单房或多房透亮区，边缘有硬化，骨皮质菲薄，轻微向周围膨隆。结论 x线为最基本的检查方法，典型病例x线平片结合临床症状即可明确诊断。

However, the deceivingly spacious residence cascades down the hill, making the most of a narrow and down sloping site.

然而，很宽敞的住宅层叠下山坡，使用大部分狭窄和向下倾斜的地点。

However , the demand curve derived in this way may slope either downward or upward the supply curve derived in this way even doesn 't exist in the monopolistic situation theoretically , if a supply curve doesn 't exist to a monopolistic producer , there are no such supply curves existing to oligopolistic and monopolistically competitive producers either .

然而这样推得的需求曲线既可能向下倾斜，也可能向上倾斜；这样推得的供给曲线，在垄断情况下就&不复存在了&；而且理论上讲，如果垄断厂商没有供给曲线，那么寡头厂商，垄断竞争厂商也会没有供给曲线。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。