mid.gut

n.（名詞）
The middle section of the digestive tract in a vertebrate embryo from which the ileum, jejunum, and portions of the duodenum and colon develop.Also called mesenteron
中腸：脊椎動(dòng)物胚胎中消化道的中間部分，回腸、空腸、部分十二指腸和節(jié)腸均屬此部位也作 mesenteron
The middle portion of the digestive tract of certain invertebrates, such as arthropods, lined with an enzyme-secreting tissue and serving as the main site of digestion and absorption.
中央管：某些無脊椎動(dòng)物，如節(jié)肢動(dòng)物消化管的中央部分，上面布有分泌酶的組織，為消化和吸收的主要部位