At room temperature the fat is broken down to triglycerides which change the PH and can make the milk sour if it sits around longer.This is different from the problem of bacteria contamination.

• 于室温的环境下，脂肪会转变成三酸甘油酯，改变酸碱度，放置长时间后会令母乳变酸，这情况与细菌感染不同。