Definition: not mixed with other colours, substances, etc. Level: B1
我们为卧室选择了一块朴素的灰色地毯。
We chose a ___plain grey carpet for the bedroom.
墙壁被刷成了朴素的浅蓝色。
The wall was painted in a ___plain light blue colour.
我更喜欢没有任何标志的朴素白色T恤。
I prefer ___plain white T-shirts without any logos.
