这个穹顶直径为42.3米。
圆的对称中心线就是直径。
它的直径实际上是 2.5厘米。
这架显微镜能把物体的直径放大100倍。
The microscope can magnify the object 100 times in diameter.
圆周内两直径必相交。
在火星上，直径小于5公里的陨石坑相对较少。
On Mars, there are relatively few craters less than 5 kilometers in diameter.
带负电荷的区域非常大：数百米厚，直径达几千米。
The negatively charged region is large: several hundred meters thick and several kilometers in diameter.
这个陨石坑现在深埋在沉积物中，最初直径约200公里。
The crater, now deeply buried in sediment, was originally about 200 kilometers in diameter.
它主要由一钢制长方体和固定在其两端的两个相同直径的钢制圆柱体组成。
It is mainly composed of a steel rectangular parallelepiped and two steel cylinders of the same diameter fixed at its two ends.
纳米晶体，也被称为量子点，是一种直径只有百万分之一毫米的半导体粒子。
Nanocrystals, also known as quantum dots, are semiconducting particles with a diameter of a few millionths of a millimeter.
棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。
The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.
阿特拉斯是两者中较平整的一个，极点间的直径只有18公里，但它的赤道周长却有40公里。
Atlas, the flatter of the two, has a diameter of only 18 kilometers from pole to pole but is almost 40 kilometers across its waist.
有些决定，如壁厚和销轴直径，可能取决于科学的计算，但非科学的部分的设计仍然是首要的。
Some decisions, such as wall thickness and pin diameter, may depend on scientific calculations, but the nonscientific component of design remains primary.
这个通道的直径只有几厘米，但它的宽度足以让电子以闪电这样看得到的形式随着通道到达地面。
The channel is only a few centimeters in diameter, but that is wide enough for electrons to follow the channel to the ground in the visible form of a flash of lightning.
不形成连续层的新生植物通常是森林中的巨人，高度可达35至70米或更高，树干直径超过2米。
Emergents, which do not form a continuous layer, are usually the giants of the forest, reaching heights of 35 to 70 m or more, and trunk sizes of over 2 m in diameter.
我们需要多大直径的金属丝？
她的头部被一颗直径为0.22的子弹击中。
一码的布料足够罩住18英寸直径帽盒的外部。
One yard of fabric is sufficient to cover the exterior of an 18-in.-diameter hatbox.
它的直径是地球直径的53%。
它巨大的叶子可长到直径2.5米长。一片发育完全的叶子可支撑一个孩子坐在其中央。
Its huge leaves grow to 2.5m in diameter, and a fully-grown leaf can support a little kid sitting in the center.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
然而，板块构造不能完全解释某些巨大的地表特征，例如非洲南部的“superswell”，即一个直径超过1000英里、高度接近1英里的巨大高原。
However, plate tectonics cannot fully explain certain massive surface features, such as the "superswell" of southern Africa, a vast plateau over 1,000 miles across and nearly a mile high.
术后12个月分别观察患者的耳廓及经主动脉内直径。
The falselumen and transaortic diameter were observed at 12 months after it.
这种测量工具用以测量奇数齿齿轮的齿顶圆和齿根圆直径。
The measuring instrument can measure addendum circle and dedendum circle diameter of odd-tooth gears.
气流的最大穿透深度随气体动量的增加而增加，而氧气喷枪的直径保持恒定。
The maximum penetration depth of gas flow is increased with the increase of gas momentum while the diameter of oxigen gunjet keeps constant.
一根直径为4.75英寸的重型电缆，使用重型卸扣和链节板连接至5英寸无钉链。
A 4.75 inch diameter heavy wireline connected to a 5 inch studless chain using heavy shackles and link plates.
影响腔室压力和温度的主要因素可以概括为气压和长度直径比。
The main factors that affect the pressure and temperature of the chambers can be summarized as air pressure and L/D.
为了评估最大横向直径和平均直径的测量值会影响曼托试验的结果。
The objective is to evaluate that the measures of the largest transverse diameter and of average diameter affect the results of Mantoux test.
为了评估最大横向直径和平均直径的测量值会影响曼托试验的结果。
The objective is to evaluate that the measures of the largest transverse diameter and of average diameter affect the results of Mantoux test.
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