well-developed

Cheeks--Well developed chewing muscles, but not so much that "cheekiness" disturbs the rectangular head form.

咬合肌发，但不能太夸张以至于变“厚脸皮”，而破坏了矩形头的整体外观。

The micrib belonging to bicollateral bundle is well developed.The bundle sheath is composed of idioblasts.

主脉发，有异细胞组的维管束鞘，具双韧皮。