便秘是当你通过粪便往往比平常少，或者当您有困难要上厕所，因为你很难和小凳子。
Constipation is when you pass stools less often than usual, or when you are having difficulty going to the toilet because your stools are hard and small.
结肠或直肠肿瘤往往会流血，且血液会慢慢进入粪便。
Tumors of the colon and rectum tend to bleed slowly into the stool.
污水包括废水和人类粪便。污水里往往有人和动物粪便中的病菌。
Sewage includes waste water and human excreta. Waste water may carry germs which are collected from human and animal excreta.
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