They look out into the sky, into the stars, and see a slight variance in light rays that come over the vastness of space, and assume a straight path, or nearly straight.
他们抬头仰望，看向群星，发现从广阔的宇宙射来的光线变化轻微，并假定光沿直线传播，或这近乎直线。
2
As the density increases, the pathof light rays emitted from the star are bent and eventually wrapped irrevocably around the star.
随着密度的增加，恒星里所发出的光线的路径会发生弯曲，并最终不可逆地围绕包裹着恒星。
3
This platform can simulate the ray tracing for a fixed frequency or sweeping frequencies, also can calculate the group path and the covered region ofrays.