If you paint something with a brush, it often leaves brush marks.

如果你用刷子粉刷某个东西，通常会留下刷痕。

We found that most brushes nowadays are man-made, which tends to leave brush marks within these lines.

当今大多数刷子都是人工的，这会给这些条纹留下刷痕。

So, we work to one standard, which is a higher standard, so we use one that leaves no brush marks at all.

我们工作遵循标准，是个更高标准，要求我们使用不留一丝痕迹的刷子。