translation.en: Now, a single trematode is tiny, microscopic, but collectively they weighed as much as all the fish in the estuaries and three to nine times more than all the birds.
translation.zh: 单单一条吸虫是小的，微观的 但是它们集合起来 和河口中的鱼等重 并且是所有鸟重量的三至九倍。