Because of their lower center of gravity, dinosaurs like Pachyrhinosaurus would've been able to recover quickly from a fall.

因为它们的重心很低，肿鼻角龙这样的恐龙摔倒后能很快爬起来。

The brain stem houses the lower nerve centers (consisting of midbrain, pons, and medulla).

脑干容纳低级神经中枢(由中脑、脑桥和延髓组成)。