ventral plug

例句：

1. 1. The scientist studied the ventral side of the fish.
   这位科学家研究了鱼的腹面。
2. 2.The researchers found a ventral opening in the rock.
   研究人员在岩石中发现了一个腹面开口。
3. 3. The spider's web is stretched across the ventral surface of the web.
   蜘蛛网横跨在蛛网上的腹面。