I was at the market, and an older guy was talking - probably mostly to himself, but somewhat toward me - lifting up loaves of bread, contemptuously saying "Calcium propionate," and putting them back on the shelf.
我在市场，有个老哥在说话——可能主要是自言自语，但也有点冲着我——拿起一条条面包，鄙夷地说“丙酸钙”，然后放回架子上。
Then he told me that he used to have an awful problem with grinding his teeth, and after reading an article, started avoiding anything with calcium propionate (it's a preservative), and he was cured.
然后他跟我说他以前磨牙磨得厉害，读了篇文章后开始避开任何含丙酸钙的东西（那是防腐剂），就好了。