在这个系统的中心圆洞中放置一枚次临界的球形可裂变物质。
In a hole in the center of this system is placed a subcritical sphere of fissionable material.
拖到绘图页上。拖动黄色菱形可调整中心圆、齿根圆和外径的大小。
Drag onto the page. Drag yellow diamonds to resize hub circle, root circle, and outside diameter.
复合中心圆结构对欧亚大陆自西向东构成三种压力：力量压力、制度压力和文化压力。
The two circular security structures pose three fold pressure to Eurasia from the east and west-the pressure from power, from system and from culture.
法兰螺栓口中心圆的直径的容许偏差及法兰相邻两孔极限容许偏差的应小于0.6毫米。
Permissible deviation of bolt hole circle diameter on flange and permissible limited deviation of two adjacent holes on flange shall be less than 0.6mm.
此类编码点具有旋转、缩放、变形的无关性，测量点是与编码点中心圆斑大小一样的圆斑。
Identifying the coded points is not affected when the coded points come forth rotation, zooming and deformation.
对圆弧型指尖密封构型特征进行了分析，确定了型线圆弧半径与圆弧中心圆半径的关系及取值范围；
The geometric feature of the arc finger seal is analysed. The relationship between the finger stick arc radius and the stick arc center circle radii and their value scope are determined too.
介绍了立式容器壳体刚性环耳式支座构件及组合截面的近似计算过程，并对地脚螺栓中心圆直径的选择作简要分析。
This paper introduces the approximate calculation of components and compound section of vertical vessel lug support with stiffening ring and the selection of anchor bolt circle diameter.
从中心的圆向外画一条短线。
圆的对称中心线就是直径。
这样的话靠观察这张图片,圆的中心在哪就可以知道？
And, now, I think I know just by looking at the picture where the center of mass of this circle will be, right?
在中部，可以看到那些同心类圆的两个中心，虽然它们并不是圆，但它们的闭合曲线确实是同心的。
In the middle, you can see these two origins with these concentric circles which are not really circles, but, you know, these closed curves that are concentric.
地轴指向北极星，在这一圈同心圆中心附近。
The Earth's axis points toward Polaris, the North Star, near the center of the concentric trails.
其他的看起来像是一组同心圆由中心向四周辐射，圆心有几架飞机。
The other pattern that looks like some sort of targeting grid is set up with concentric rings of what appear to be structures with straight spokes radiating out from the center.
举个例子来说，把一个圆绕中心旋转，你会发现它保持不变。
A circle, for example, is symmetric under rotations around the center of the circle. You rotate around the center of the circle, the circle remains unchanged.
比方说，圆是中心对称的。
A circle, for example, is symmetrical under all rotations about the center of the circle.
通过拖动可向弧或圆添加尺寸。将线端放在弧中心上，并将黄色的菱形放在弧线上。
Drag to add a dimension to an arc or circle. Place line end at arc center, and yellow diamond on arc.
用于表示圆或弧的中心，还可表示对称。
Use to indicate the centers of circles and arcs, and to represent symmetry.
只有一个中心点的圆拱。
取一张圆纸板，在其两侧的中心分别打两个孔，用多根线穿过每个孔。
TAKE a cardboard disc and punch two holes in it, on either side of its centre.
用牙签或者小刀从圆的中心向四面划，形成蜘蛛网的形状。
Drag toothpick or knife through sour cream from center outward to make spider web design.
汽车轮毂PCD值是指螺栓安装孔的中心连接而成的截面圆的直径。
The Wheel PCD is the diameter of the studs from the centre of the wheel.
后者在其中心有一圆柱形沟槽，这样能生成整体芯在钻孔作业过程中引导钻头。
The latter has a cylindrical groove at its center, thus generating a solid core, which guides the tool as it proceeds during the drilling operation.
纸板，厚圆卷筒中心，打破了。
用于向弧或圆添加尺寸。将端点放在弧中心上、控制手柄放在弧线上。
Use to add a dimension to an arc or circle. Place endpoint at arc center, control handle on arc.
如加工轴类工件时，总是先加工中心孔，再以中心孔为基准加工外圆表面。
When machining shaft parts, always machining center hole, and then to the center of the center hole for the processing of the outer surface.
如加工轴类工件时，总是先加工中心孔，再以中心孔为基准加工外圆表面。
When machining shaft parts, always machining center hole, and then to the center of the center hole for the processing of the outer surface.
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