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Oogonium develops into early oocyte in the ovary, and then the oocyte leaves the ovary for the coelomic fluid in the form of single cell or cell mass followed by the rapid separation of the group of oocytes into individual ones. Oocyte enters into the nephridium after its maturation. The rupture of germinal vesicle marks the oocyte maturation. Oocyte in the coelom does not have follicle membrane and vitelline membrane is formed and developed by the oocyte itself. Smaller oocyte (0μm in diameter) is round, and larger ones (≥60μm in diameter) is ovate. The short and long diameters of a morphologically mature oocyte are about 115—120μm and 140—145μm respectively, and the vitelline membrane is 7—9μm thick.

卵原细胞在卵巢中发育至早期卵母细胞时期单个或成团脱离卵巢入体腔液中，卵母细胞团细胞很快分离为单个细胞；卵母细胞在体腔液中发育成熟后进入肾管；生发泡破裂是卵母细胞成熟的标志；体腔中卵母细胞无滤泡膜，卵黄膜的形成与发育靠卵母细胞本身；卵径小于60μm的卵母细胞呈圆形，卵径大于60μm 的卵母细胞为卵圆形，形态上成熟的卵母细胞短径约115—120μm、长径约140—145μm、卵黄膜厚7—9μm。

The centre of this wooden disc was hollowed out to a diameter equal to the exterior diameter of the Columbiad.

这木盘中间留着一个直径相当于哥伦比亚炮外径的圆洞。

The results showed that Prunus mongolica was excellent germplasm resources resist to crown gall. The range of diameter was 0~16.6 mm and mean diameter of tumor in all plants is 6.60 mm at 70 days after inoculation.

结果表明：接种后70d，株平均瘤径范围在0~16.6mm，群体平均瘤径6.6mm，蒙古扁桃对发根土壤杆菌中度感病，实生群体抗性分离宽泛，其中存在免疫、高抗、中抗、中度感病和高度感病5种类型，分别占8.60%、19.23%、14.42%、33.65%和24.04%。

On mountainous sites, grade Ⅰ or Ⅱ stands including land below the crown of the secondary broadleaf forest and the Chinese-fir plantation or east-facing, shady dry land could be considered for the plantation. The transmittance of crown in the areas should be 55%~60%. One-year-old high quality seedlings above 25 cm tall and 0.25 cm in diameter near the ground-level should be used. For high-yield, field cultivation, shading facility should be considered and seedlings of taller than 15 cm and greater than 0.15 cm in diameter near the ground should be applied. The appropriate density and sunlight transmittance ought to be 30 cm×30 cm and 50%, respectively.

结果表明，利用山地种植，选择透光率为55%~60%的Ⅰ、Ⅱ类立地的残次阔叶林和杉木林冠下，或地形隐蔽、东向的山垅旱地，选用苗高25 cm以上、地径0.25 cm以上的1年生优质苗木造林；利用农田进行庇荫设施高产栽培，应选用苗高在15 cm以上、地径0.15 cm以上规格的苗木栽植，适宜栽植密度为30 cm×30 cm，遮阳透光率在50%左右。

Nickel wires with a diameter of approximately 250 nm had single-domain structure,while unique core-shell cylindrical domain structures were found in wires with a diameter of 2μm.

MFM观测结果表明，直径250 nm的镍纳米线拥有单磁畴结构；而直径2μm的镍线的磁力图呈现的是新颖的核—壳圆柱形磁畴。

The results show that the dispersity of emulsion is good and the average diameter of particles is about 15 nm. Its bactericidal properties to some bacteria and epiphytes are strong under daylight lamp irradiation. The killing rate to Gram negative bacterium (Staphylococcus aureus and Bacillus subtilis) is 100%, in addition, killing activity of it to Gram positive bacterium is very high. It has a clear antibacterial circle of about 20 mm in diameter toward epiphytes such as Aspergillus niger, Aspergillus flavus and Candida albicans etc.

结果表明，混晶乳液分散性好，粒径约15nm；在普通日光灯照射下，乳液对一些细菌和真菌有很好的抗菌性能：对革兰氏阳性菌（金黄葡萄球菌和枯草芽孢杆菌）的杀灭率达到100%，对革兰氏阴性菌也有很好的杀灭性能，对黑曲霉、黄曲霉和白色念珠菌等真菌产生清晰的抑菌圈，抑菌直径约20mm。

Carbonyl iron fibre with different Fe content (90%~98wt%) and diameter (200nm~l0μm) had been fabricated by adjusting fibre growth factors, such as velocity of Fe5 vapor and protective gas, temperature of chemical decomposition and magnetic field strength. So the diameter of carbonyl iron fibre could be controlled from micron to sub-micron.

对羰基化合物气化速率、保护气氛流量、分解温度和外加磁场强度等因素的调控，制备出铁含量在90%~98%可调、直径在亚微米到微米(200nm~10μm)及长径比可控的羰基铁纤维。

Liu Hui, a mathematician of the Three Kingdoms period, claimed that "3 to 1" was rather a ratio of the circumference of the inscribed hexagon with the diameter of the circle than a ratio of the circumference of the circle with the diameter.

刘辉说，数学家的三国时期，声称" 3比1 "是相当比例的周长与登记六边形直径的圆圈比比圆周长与直径。

The metric system for spur-gear calculations involves more than changing inches to millimeters .the basis for calculations in the American inch system is diametral pitch ,which is the number of teeth divided by the pitch-cirle diameter .In the metric-circle diameter by the number of teeth .

公制为spur-gear计算多变化，依据英寸到毫米的计算系统在美国英寸直径的球场，这是数量除以pitch-cirle直径的牙齿。metric-circle直径的牙齿。

Tooth Proportions.—There are 17 pitches: 2.5/5, 3/6, 4/8, 5/10, 6/12, 8/16, 10/20, 12/24, 16/32, 20/40, 24/48, 32/64, 40/80, 48/96, 64/128, 80/160, and 128/256. The numerator in this fractional designation is known as the diametral pitch and controls the pitch diameter; the denominator, which is always double the numerator, is known as the stub pitch and controls the tooth depth. For convenience in calculation, only the numerator is used in the formulas given and is designated as P. Diametral pitch, as in gears, means the number of teeth per inch of pitch diameter.

齿比——一共有17种齿比：2.5/5，3/6，4/8，5/10，6/12，8/16，10/20，12/24，16/32，20/40，24/48，32/64，40/80，48/96，64/128，80/160和128/256在这一系列的分数中的分子是径节，径节的大小决定了节圆的直径；而分数中的分母通常是分子的两倍，分母是残余径节，它的作用是控制齿槽的深度为了方便计算，在所有的公式中都使用分子作为计算参数，并且与齿轮的表示方式一样定义为径节P尺寸，也就是在节圆上，每英寸长度上的齿数

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"