The artist painted in water colors.

那个画家用水彩作画。

Does the artist paint in water colors or in oils?

那位艺术家是画水彩的，还是画油彩的？

The technique here is unlike that used in his water colors of the period.

在这幅画中所用到的技法与同时期他画的水彩画有所不同。

Water colors have a close connection with phytoplankton species composition.

水色与浮游植物种类组成密切相关。

Water colors are an ancient genre of painting with a long history in the west.

水彩画是西方绘画中历史悠久的一种绘画类别。