求翻译：3、腹痛较重或大便潜血阳性者进食半流食、消化道有明显出血者应禁食，注意观察生命体征及大便颜色，及时送检。是什么意思？

3, abdominal pain heavier semi liquid diet, eating or positive fecal occult blood is significant hemorrhage of digestive tract should be fasting, observe the vital signs and stool color, submitted in a timely manner.