This line is tangent to the circle.

这个直线和圆相切。

Radius must be smooth and blend into the face.

圆弧必须光平面相切。

We start off by drawing the square whose side lengths  are all tangent to that circle.

我们首先绘制边长都该圆相切的正方形。

Finally, you draw a curve that's tangent to each wavelet, meaning that it touches each half circle at exactly one point.

最后，绘制一条每个小波相切的曲线，这意味着它好在一个点接触每个半圆。

In the ensuing confusion the US 1st Division cut across McArthur's 42nd Division in the race to Sedan, offending the sensibilities of the French.

在随后的混乱中， 美军第1师在前往色当的竞赛中麦克阿瑟的第42师相切，触怒了法国人。

And again, since this is a point where the corner sphere is tangent to the inner sphere, it's also a point of the inner sphere.

同，这是角球体内球体相切的点，因此它也是内球体的点。

Near the magnetic poles of a neutron star, an electron can be accelerated by the magnetic field and emit a so-called curvature photon, tangential to the magnetic field line.

在中子星磁极附近，电子可以被磁场加速并发射磁场线相切的所谓曲率光子。

Pro tip, anytime you're doing geometry with circles or spheres, keep at the forefront of your mind that anything tangent to the circle is perpendicular to the radius drawn to that point of tangency.

专业提示，任何时候你用圆或球体做几何图形时，请记住，圆相切的任何东西都垂直绘制到该切点的半径。