Translation of "stems" into Chinese

Is the stem round and hollow, and does it have nodes, or joints?

草秆是圆形、中空、有节的。

Do successive blades arise on opposite sides of the stem, creating two vertical rows?

叶片狭长扁平、有平行直纹,叶鞘包秆,叶片从叶鞘长出,在茎的两旁互生,排成两列。

Soluble factors including chemokines or growth factors released and expressed by glioma cells at least mediate the tropism of stem cells for gliomas.

胶质瘤细胞分泌的可溶性因子包括趋化因子或生长因子可以介导干细胞的胶质瘤趋向性。