Warhol used a very smooth painting method so the artwork almost did not look hand-made.

沃霍尔使用了一种非常流畅的绘画方法，因此这些艺术品看起来根本不像是手工绘制。

This is a very important painting technique, and I am very grateful to my teacher for letting me learn this painting method.

这是一个很重要的绘画技巧，非常感谢老师让我学会了这种绘画方法。