ventral tubercle

例句：

1. 1. The animal's ventral side is smooth and hairless.
   动物的腹面是光滑且没有毛的。
2. 2. The ventral muscles of the fish are responsible for propulsion.
   鱼的腹面肌肉负责推进。
3. 3. The ventral region of the vertebrate body is home to many important organs.
   脊椎动物身体的腹面区域有许多重要的器官。