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Cui Jingqin, 40, who has handed over her 10-year-old son, Wu Ruili, to the elderly women since the program began, is a self-employed laborer. She said her parents-in-law are in poor health and need to be taken care of, and she and her husband don't have enough time or education to help with their son's studies.

"The learning atmosphere here is good. My son has made progress this semester, especially in math," she said.