"Comrade Li Yuan, please explain the mechanism behind women's menstruation.",Both parents and seven sets of siblings, along with their nephews and nieces, all ate窩頭 (a type of flatbread made from coarsely ground maize). The saved white flour, eggs, and meat were all given to the youngest one who was the weakest.,Although the past two years have been more difficult, overall life has been manageable because we had several consecutive years of agricultural surplus beforehand.。