不要把沿圆周的切向加速度与向心加速度混淆。
Do not confuse ever the tangential acceleration, which is along the circumference, with centripetal acceleration.
圆周的距离是围绕一个封闭的曲线。
进入那使方向模糊以便它是相同于圆周的线。
Enter the Blur Direction so that it is the same as the line in the circle.
但是别把这个切向加速度，它是沿着圆周的，和向心加速度混淆。
Do not confuse ever the tangential acceleration, which is along the circumference, with a centripetal acceleration.
绕转之后移动方向为自南向北，也是沿圆周的切线运动。
Both of approaching and returning movements are along the tangent of the circle.
你也可在班上讨论圆周运动，为何球不会在圆周的顶端掉下。
You can also discuss circular motion with your class, explaining why the ball doesn't fall off the track at the top of the loop.
这是清理毛刺和一个环形的制件的内在和外面圆周的边缘精整的例子。
This is an example of deburring and edge finishing of the inner and outer circumferences of a ring-shaped workpiece.
它的变迁从内部而言，可以看成是一个不同半径组成的大小不等圆周的漩涡。
Seen from interior, its vicissitude is just like the whirlpool made of various circumferences with different radius.
譬如，在几何学里我们必须假定，一个圆周的圈线是由无限多喝无限小的直线形成的。
Thus in geometry you are told to conceive the circumference of a circle as formed of an infinite number of infinitely small straight lines.
一般一个完美圆周的偏心值为0，而约有一半的系外行星的偏心值在0.25或者更高。
Where a perfect circle has an eccentricity value of zero, roughly half of exoplanets seen thus far have an eccentricity of 0.25 or greater.
形成沿径向相对于中心轴隔开第二距离以限定外圆周的第二多个导电性通孔(104)。
A second plurality of conductive vias (104) is formed radially spaced a second distance about the central axis so as to define an outer circumference.
先前的研究也已经证明了自闭症儿童大脑的“过度生长”，但这些研究都是关于大脑圆周的测量或磁共振成像，专家说。
Prior research has also documented "brain overgrowth" in autistic children, but those studies were done by measuring brain circumference or MRIs, experts said.
圆周的对称点与球透镜的齐明点虽然有一个相同的表达式，但这两类不同范畴的共轭点有着内在的差异，分析这种差异，有利于更好地理解它们。
The circular symmetric point and the apalanatic point of spherical lens have one same expression, however the two kinds conjugate point are belong to difference category.
圆周上各点离圆心的距离相等。
假设您想要创建一个放射状的列表框，将其内容沿圆周排列，就像一个旋转木马。
Imagine you want to create a radial list box that arranges its content along a circle, like a carousel.
进化论的作者、年轻的英国植物学家查尔斯·达尔文，是第一个看到落叶柏树干圆周长达一百三十英尺的欧洲人。
A young English botanist named Charles Darwin, the author of the theory of evolution, was the first European to see alerces, with trunks that had a circumference of 130 feet.
我们也可以用角度来做参数的，但不是在这个例子里，而是在沿圆周运动或一些类似的情况时使用。
And we could also have used maybe some Angle. Well, not here, but if we had been moving on a circle or something like that.
匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。
Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.
我跳起来，旋转，绕着每个星球的圆周行进，玩笑般的对付着地心引力。
I leap, I spin, I navigate the circumference of each spherical planet, toying with gravity.
亚里士多德理论都是基于天堂里的物体，做圆周运动这一基础思想而展开的。
Now, the Aristotelian theory, as I said, was based on the idea that all heavenly bodies basically move in circles.
pai是一个数学常量，代表圆周长跟直径的比值。
It's a mathematical constant representing the ratio of any circle's circumference to its diameter.
为了显示属于软件包的分类器属于，从每个分类器画一条线到里面有加号的圆周，这些圆周粘附在软件包之上(图9)。
To show what classifiers belong to the package, a line is drawn from each classifier to a circle that has a plus sign inside the circle attached to the package (Figure 9).
究竟何物把上帝完美的圆周运动替换成了物质的奋斗呢？
Which instead strives to imitate the perfection of God by moving in circles?
我们需要把看出一个接一个很小的圆周运动的叠加。
We need to add smaller circular motions on top of each other, and so on.
那是因为，至少在圆周长度方面，我们星球上的一些地方比其他的要大。
That's because some parts of the planet are much bigger than others, at least in circumference.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
数学迷们将在本周末庆祝他们的圆周率日，这一天之所以落到3月14号是为了纪念这个这个著名比例的头几位：3.14。
Mathematics enthusiasts will this weekend be celebrating Pi day, which falls on 14 March in honour of the famous ratio's first few digits, 3.14.
尽管这样，实际上在天文上一回归年中有365.24219天——一回归年指的是由地球上观察，太阳在天空运行一整个圆周所用的时长。
It turns out, however, that there are 365.24219 days in an astronomical "tropical" year-defined as the time it takes the sun, as seen from Earth, to make one complete circuit of the sky.
尽管这样，实际上在天文上一回归年中有365.24219天——一回归年指的是由地球上观察，太阳在天空运行一整个圆周所用的时长。
It turns out, however, that there are 365.24219 days in an astronomical "tropical" year-defined as the time it takes the sun, as seen from Earth, to make one complete circuit of the sky.
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