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

我们首先制边长都与该圆切的正方形。

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

，制一条与每个小波切的曲线，这意味着它恰好在一个接触每个半圆。

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.

同样，由于这是角与内切的，因此它也是内的。

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与磁场线切的所谓曲率光子。

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，任何时候你用圆或做几何图形时，请记住，与圆切的任何东西都垂直于制到该切的半径。