“Coming!” Hearing a doorbell, Aunt Li opened the door, and the clerk in the box malinli downstairs had delivered the dinner ingredients to the door. “It’s really a big help for US elderly people who have inconvenient legs and feet, can’t lift heavy objects and need to look after our grandchildren.” Aunt Li sighed that it is not only cheap and affordable to buy vegetables now, but also sent to the home. The life post station outside the community is now really at the “door of home”. Many consu...