Xylem has the function of supporting plants.

木质部具有支撑植物体的作用。

Xylem is the transport organization of vascular plants.

木质部是维管植物的运输组织。

Xylem consists of ducts, tracheids, wood fibers, wood parenchyma cells and wood rays.

木质部由导管、管胞、木纤维和木薄壁组织细胞以及木射线组成。

Tree rings are made of tissue called xylem.

构成年轮的组织被称为木质部。

The xylem of ferns only contains tracheids.

蕨类植物的木质部只含有管胞。

The xylem of ferns and conifers contains only tracheids.

蕨类植物和针叶树的木质部仅含有管胞。

Sapwood contains xylem vessels, but not as strong as heartwood.

边材含有木质导管，但不如中心木质那样坚硬。

Sapwood contains xylem vessels, but not as strong as heartwood .

边材含有木质导管，但不如中心木质那样坚硬。