road as twisty as sheep's intestine (idiom) / narrow and winding road / fig. complicated and tricky job
回肠
huí cháng
ileum (segment of small intestine between the jejunum 空腸|空肠[kong1 chang2] and appendix 盲腸|盲肠[mang2 chang2])
空肠
kōng cháng
jejunum (empty gut, middle segment of small intestine between duodenum 十二指腸|十二指肠[shi2 er4 zhi3 chang2] and ileum 回腸|回肠[hui2 chang2])
六腑
liù fǔ
(TCM) the six hollow organs: gallbladder 膽|胆[dan3], stomach 胃[wei4], large intestine 大腸|大肠[da4chang2], small intestine 小腸|小肠[xiao3chang2], triple heater 三焦[san1jiao1], bladder 膀胱[pang2guang1]