phase out
withdraw sth．gradually or in stage逐步停止；逐步撤去；逐步淘汰
Will that country phase out its oil exports？那个国家会逐步停止输出石油吗？
The agreement called for the phasing out of troops in the area．协议要求从那个地区逐步撤出军队。
The old machinery here will be phased out．这里的旧机器将被逐步淘汰。