mid-girth

例句：

1. 1. The horse's mid-girth is measured to determine its weight.
   马的中腰被测量以确定其重量。
2. 2.The engineer used the mid-girth of the beam to calculate its strength.
   工程师使用梁的中腰来计算其强度。
3. 3. The runner's mid-girth was stretched by the tension of the race track.
   赛跑者在赛道的压力下拉伸了中腰。