Ganymede is also criss-crossed with large grooves.

木卫三上也布满了纵横交错的沟壑。

So in order to squeeze all that material into your skull, the brain forms little creases, called gyri, and larger grooves, or sulci, giving it more folds than than an origami pineapple.

所以为了把所有的材料挤进你的头骨，大脑会形成小折痕，叫做脑回，和更大的凹槽，或者说沟，给它比折纸菠萝更多的褶皱。