我随便查了查, 什么dried fruits, salad bar veg, wine etc etc都用了硫。。。
"The process of preserving food with sulphur dioxide is intended to provide a longer shelf life, kill harmful bacteria that might grow on vegetation and foods, and help food products maintain a certain visual appearance."
"sulfur dioxide is used to preserve and avoid discoloration in dried fruit..."
"Sulfites, such as sulfur dioxide, not only help prevent foods from becoming discolored, they also discourage the growth of bacteria. Additionally, they can soften dough or bleach foods. Although most people don't experience any side effects when they eat dried fruits preserved with sulfur dioxide, about 1 percent of the population is sensitive to these chemicals and may experience potentially dangerous side effects. If you are among those who are sensitive to sulfites, you need to avoid foods that contain sulfites."