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?
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.
从中心的圆向外画一条短线。
圆的对称中心线就是直径。
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.
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.
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.
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.
圆本身就是一个很大的点：除了一个中心点坐标，其还需要一个半径来表示。
A circle is just a big point: in addition to the center coordinates it needs a radius.
你可以测试，制作一个精确地通过中心线的圆，然后用测试结果在右视图混合曲面。
You can test this by making the circle go exactly through the centerline and then examine the resulting blend surface in the right view.
采用光滑圆棒和中心孔板片试样，对GH901合金室温高低周复合疲劳进行了系统的研究。
The fatigue behaviours of Superalloy GH901 under major combined with minor cycle have been systematically studied at room temperature using smooth specimen and sheet with center hole.
中心部分是一个圆切正方形广场，整个城市的建筑构思恰如“天圆地方”的宇宙天体的微缩景观。
It is a central part of a round cut square square, the whole city's buildings are good idea, "arguing" a miniature universe celestial landscape.
然后把醒好的面切成一个个小面团，用擀面仗把它擀成圆而薄的饺子皮，把饺子馅放到皮中心包起来捏紧即可。
Then cut the large ipece of dough into many small pieces, roll the dough with a rolling pin into round, thin wrappers. Put the filling in the center of a wrappper, and fold it up.
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.
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.
给出了一种亚音速方转圆扩压器的设计方法，并对中心线形状、型面变化规律和扩张角等进行了选择和说明。
For matching turbine work condition, designed a diffuser that transformed square to round, chose Central Line and shape changed method, defined diffuser expanding Angle.
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.
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.
给出了非圆齿轮的节曲线极坐标方程，两齿轮中心距的计算方法，节曲线长度、基础圆半径和压力角的计算公式。
The polar equation of non-circular gear pitch curve, calculation method of center distance, formula of pitch curve length, primary circle radius and pressure Angle is given.
通过对圆的直径和中心坐标的测量实验，结果表明，该方法切实可行。
The experiments conducted on the diameter of circle and coordinates of circle center reveal that this method is practical.
通过对圆的直径和中心坐标的测量实验，结果表明，该方法切实可行。
The experiments conducted on the diameter of circle and coordinates of circle center reveal that this method is practical.
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