上海地铁宝山路站提前完成升级改造，3/4号线明日全线贯通恢复运营

Group 1 - The core point of the article is that the upgrade and renovation of the Baoshan Road Station on Lines 3 and 4 of the Shanghai Metro was completed one day ahead of schedule on February 21, allowing for the resumption of normal operations on February 22, just in time for the peak return travel period during the Spring Festival [1] Group 2 - The upgrade project was aimed at improving the infrastructure of the metro station to better serve passengers during the busy travel season [1] - The temporary shuttle bus service that was in place during the renovation will be canceled following the resumption of normal metro operations [1]