ventral abdominal appendage

例句：

1. 1.The ventral side of the fish is covered in scales.
   鱼的腹侧覆盖着鳞片。
2. 2.The ventral fin helps the fish to swim efficiently.
   腹鳍帮助鱼高效游泳。
3. 3. The ventral part of the body is covered with soft tissue.
   身体腹面覆盖着柔软的组织。