有一部分比较膨大就是其嗅觉中枢，这部分大脑跟气味感觉相关。

One thing that is kind of expanded though is the olfactory centers, the centers associated with the sense of smell.

它纤小的大脑只有最基本的视觉和嗅觉中枢。

Its small brain has just rudimentary centers of sight and smell.