她为正式活动选择了一件朴素的灰色连衣裙。

She chose a ___sober gray dress for the formal event.

彼得穿了一套蓝色西装，系了一条朴素的领带去开会。

Peter wore a blue suit and a ___sober tie to the meeting.

办公室装饰采用素雅的色调，以保持专业的氛围。

The office decor features ___sober colors to maintain a professional atmosphere.