大便
excrement
to defecate
feces
你的大便里有血或粘液吗?
Be there any blood or mucus in your stool?
便秘有困难的、不完全的或不经常从肠道排泄干燥且硬的大便
Difficult, incomplete, or infrequent evacuation of dry, hardened feces from the bowels.
他每天大便两次.
He goes to stool twice a day.
小便
urinate
urine
pass water
我憋不住了（要小便）, 得找个厕所.
I can't hold out (ie retain my urine) much longer; I must find a toilet.
‘小便’是‘排尿’的委婉语.
`Pass water' is a euphemism for `urinate'.便
