1. 乙状结肠：sigmate S形的 | sigmoid flexure 乙状结肠 | sigmoid S形的
2. 状挠曲：标准差(粒径) sigma phi | S状挠曲 sigmoid flexure | S状沙丘 sigmoidal dune
sigmoid flexure的解释
noun
1. sigmoid flexure
1. the s-shaped curve between the descending colon and the rectum
Synonym: sigmoid colon