When Ms.Wus husband talks about going to Nanjing to find work this summer after the construction jobs dry up in Beijing, her quick smile fades and she puts her head in her hands.

• 当吴宗兰的丈夫谈到他今夏可能去南京的建筑工地找活干时，吴宗兰刚刚露出的笑容消失了，她用手托着自己的头。