The skull also lacks a blowhole, another cetacean adaptation for diving.
它的头骨也是没有气孔的，这是鲸类动物为潜水而作出的另一适应。
2
The skull is cetacean-like but its jawbones lack the enlarged space that is filled with fat or oil and used for receiving underwater sound in modern whales.
它的头骨与鲸类相似，但它的下颚骨没有现代鲸鱼用来接收水下声音的、充满脂肪或油脂的扩充空间。
3
Cetacean experts do not expect whales to escape this slick completely.