Each planarian an ocean unto itself, full of unknowns.

每个真涡虫本身就是一片海洋，充满了未知数。

There was a pause while Dredge turned and laid his extinguished pipe carefully between a jar of embryo sea-urchins and a colony of regenerating planarians.

德雷奇转过身，小心翼翼地将熄灭的烟斗放在一罐胚胎海胆和一群正在再生的涡虫之间，停顿了一下。