椭圆形

Methods. An elliptical or a cloverleaf-shaped indentor covering 40% of the endplate was axially compressed against the superior endplate of 48 thoracolumbar vertebrae.

在48块胸腰椎椎体中，选用椭圆形或者四叶状的锯齿边缘的压力器，接触椎体的面积约为40％的终板面积，作轴向压迫。

The influence of indentor radius on the plastic deformation has been discussed and some important results are as follows:(1) The influence of the ratio of ceramic coating thickness to indentor radius on the failure of coating, plastic deformation of substrate and crack propagation are obvious.(2)The propagation of crack in ceramic coating is assumes to be of semi-elliptical shape under normal contact with a rigid sphere.(3)Fatigue life of ceramic coating is mainly decided by substrate and load, the lower substrate elastic moduli and load, the more cycles of fatigue.

分析了压头半径对塑性变形的影响，模拟结果表明；(1)陶瓷涂层厚度和压头半径之比对涂层失效、基体塑性变形及裂纹的形成有显著影响；(2)在刚性球压头静态挤压条件下，陶瓷涂层中的预制裂纹按照椭圆形裂纹规律扩展；(3)陶瓷涂层的疲劳寿命与基体和载荷有很大关系，基体弹性模量越小，疲劳寿命延长。

Leaves petiolate (0.5-1.5 mm), narrowly elliptic to oblong, not reticulate-veined but with conspicuous intramarginal vein; sepals persistent, ovate to narrowly lanceolate, not leaflike; capsule 9-15 mm, bright red at first when maturing.

叶具叶柄(0.5-1.5毫米)，狭椭圆形到长圆形，网状脉但是具明显的边脉的不；萼片宿存，卵形到狭披针形，不叶状；成熟时最初的蒴果9-15毫米，鲜红色。 13 H。 acmosepalum 尖萼金丝桃

Leaves opposite; petiole 4-7 mm; leaf blade elliptic to obovate, 3-8 × 1-4 cm, leathery, pubescent when young but glabrescent and shiny with age, abaxially gray tomentose, secondary veins 1 on each side of midvein, originating near leaf blade base, and meeting at apex, tertiary veins 4-6 on each side of midvein and connecting midvein to secondary veins, reticulate veins obvious, intramarginal veins 3-4 mm from margin, base broadly cuneate, apex rounded to obtuse and often slightly emarginate or sometimes slightly apiculate.

叶对生 叶柄4-7毫米；叶片椭圆形到倒卵形， 3-8 * 1-4 厘米，革质，幼时具短柔毛但老时脱落无毛和发亮的，背面灰色被绒毛，次脉在中脉两边各1，近叶片基部发出，在先端会集，第三脉在中脉两边各4-6和连结中脉和次脉，网脉明显，近边缘内脉距边缘3-4毫米，基部宽楔形，先端圆形到钝和通常稍微凹或有时稍具细尖。

Leaves sessile or subsessile; blade ovate or oblong to elliptic or oblanceolate or linear,(0.3-)0.8-2.5 cm × 3-12 mm; thickly papery to subleathery, abaxially glaucous or sometimes minutely papillose; laminar glands pale, dots, rather sparse, prominent above; intramarginal glands black, dense or irregular; main lateral veins 3- or 4-paired, sometimes forming ± marked submarginal vein, tertiary reticulation lax or obscure; base cuneate to angustate, margin entire and recurved, apex acute to rounded.

叶无柄或近无柄；线形的卵形的叶片或长圆形到椭圆形或倒披针形或，(0.3-)×3-12毫米0.8-2.5厘米；厚纸质到近革质，背面苍白或有时稍具小乳突；片状腺体苍白，小圆点，相当稀，在上面突出；近边缘内腺体黑色，浓或者不规则；主要侧脉3-或4对，有时形成多少显著的亚缘脉，第三级网脉疏松或不明显；基部楔形到狭，边缘全缘和下弯，先端锐尖到圆形。

The oval-shaped stones are white with an iridescent quality that reveals a shimmer of rainbow colors in the light.

椭圆形的石头是一个闪光的质量，揭示了光的彩虹颜色白色微光。

"Botanically unrelated to the white, or Irish, potato or the yam, sweet potatoes are oblong or pointed oval, tuberous root s."

与白色马铃薯及薯蓣无亲缘关系。甘薯为椭圆形或带尖的卵圆形块根

"Botanically unrelated to the white, or Irish, potato or the yam, sweet potatoes are oblong or pointed oval, tuberous roots."

与白色马铃薯及薯蓣无亲缘关系。甘薯为椭圆形或带尖的卵圆形块根

"Botanically unrelated to the white, or Irish, potato or the yam, sweet potato es are oblong or pointed oval, tuberous roots."

与白色马铃薯及薯蓣无亲缘关系。甘薯为椭圆形或带尖的卵圆形块根

Fund Project: the National Natural Science and Technology Source Program, No. 2001DEA1006*Abstract: Number of neural stem cells is small. NSCs look like circle or ellipse with or without short neurite, with large nuclear-cytoplasmic ratio and deep karyotin. NSCs have no visible differences with other kinds of cells in appearance, and have no cell surface marker. Currently, there are mainly three aspects to identify NSCs: expression of specific nerve antigen, including nestin, Musashi, transcription factor, and cell adhesion molecules; self-renewal ability including single cell clone analysis, BrdU mark and S phase cell; the potential of multi-direction differentiation including immunocytochemical process and reverse transcriptase polymerase chain reaction.

由于神经干细胞的数量很少，从细胞形态来看神经干细胞为圆形或椭圆形，无或有较短的突起，核质比大，核染色较深，形态上与其它种类的细胞没有明显的差异，并且未找到一种细胞表面特异性标志物，因此目前鉴定神经干细胞主要有以下3个方面：特异性神经抗原的表达，包括巢蛋白、Musashi、转录因子及细胞黏附分子；自我更新能力，包括单细胞克隆分析、BrdU标记S期细胞；多向分化潜能，包括免疫细胞化学法、聚合酶链反应色法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。