alimentary canal       
noun [ C ]  medical specialized uk/æl.ɪˌmen.tər.i kəˈnæl/ us/æl.əˌmen.t̬ər.i kəˈnæl/ (also alimentary tract)
 消化道,食道
the parts of the body that food goes through as it is eaten and digested
  I had an abscess in the lower part of my alimentary canal.
 There may be an obstruction in the alimentary tract.
 Synonym: digestive tract
 - More examples
 - Give him something to drink that is not too irritating to the alimentary canal.
 - Foods that are high in fibre help peristalsis to take place in the alimentary canal.
 - A bowel movement every day is not a guarantee of a healthy alimentary canal.
 - Crohn's disease is a chronic inflammatory disorder that can affect the entire alimentary tract.
 - Mental or emotional factors can exert a powerful influence on the alimentary tract.