marsupium

例句：

1. 1.The horse was marsupium, and it was difficult to control.
   那匹马是马身肿，很难控制。
2. 2. The veterinarian had to perform an emergency surgery on the horse to relieve its marsupium.
   兽医不得不对这匹马进行紧急手术来缓解它的马身肿。
3. 3.The marsupium in the horse's belly caused him to have difficulty breathing.
   马腹中的马身肿使他呼吸困难。