On the other hand, the position of the eyes in most dolphins and porpoises suggests that they have stereoscopic vision forward and downward.

另一方面，大多数种类的海豚和鼠海豚的眼睛位置表明，它们在向前和向下的方向上是有立体视觉的。

However, the position of the eyes so restricts the field of vision in baleen whales that they probably do not have stereoscopic vision.

然而，眼睛的位置却极大地限制了须鲸的视野，所以它们可能并不具备立体视觉。