Although biologists can easily induce extra limbs to grow on the flank of a tetrapod this cannot be done in the neck.

虽然生物学家能轻易让四足动物在侧腹长出额外的肢，在颈部却做不到。

Although biologists can easily induce extra limbs to grow on the flank of a tetrapod, this cannot be done in the neck.

虽然生物学家能轻易让四足动物在侧腹长出额外的肢，在颈部却做不到。

And the fusing of bones making up the lower jaw fortified this region, facilitating the presumed" buccal pump" mode of tetrapod ventilation.

下颔部位骨头的愈合也加强支撑力，帮助可能以口部当做帮浦的形式换气。