saturation point
noun uk/sætʃ.əˈreɪ.ʃən ˌpɔɪnt/ us/sætʃ.əˈreɪ.ʃən ˌpɔɪnt/
reach saturation point 达到饱和点
to reach a stage where no more can be added, contained, or accepted
Demand for cars in the developed world will have reached saturation point within 20 years. 不出20年，发达国家的汽车需求将达到饱和点。