摘要
Five years ago, Granny Bi and her family moved out of the two rooms where they had lived for most of Granny Bi’s life, and moved into a three-room flat in an apartment building in Panjiayuan, a newly built residential area in southeast Beijing. Life in their new home was easy and convenient. Granny Bi was extremely happy. But a few days later, she found that she could not open the windows;
