1915年,一个名叫卡尔的生物专业的大学生作为一家牛奶公司的推销员来到中国。这次中国行影响了他的一生。卡尔注意到,农家把紫色苜蓿碾碎后掺到面粉中,做成一种叫“草头摊粞”的煎饼,吃了可以预防疰夏。而且农民大多以新鲜蔬菜和糙米为主食,从来不会患脚 In 1915, a biology major named Karl came to China as a salesman for a milk company. This trip to China affected his life. Carl noticed that the farmhouse crushed purple alfalfa into the flour and made a kind of pancake called “grass head stall”, which could prevent the summer harvest. And farmers mostly fresh vegetables and brown rice-based food, never suffering from foot