同学你好，该知识点来自沪江网校《大学水平直达CATTI笔译（三级+二级）【6月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好～
contraction医学用语， 意思是 a very strong and painful movement of a muscle, especially the muscles around the womb during birth 专门指 肌肉挛缩;〔尤指分娩时的〕子宫收缩
constriction意思是to make something narrower or tighter, or to become narrower or tighter（使）收缩，（使）收紧; 压缩; 压紧
  Caffeine constricts the blood vessels in your body.
  咖啡因会收缩体内的血管。
  Linda's throat constricted and she started to cry.
  琳达喉咙发紧，哭了起来。
希望对同学有帮助，学习进步～