管状的

Fig.2—8 SEM observation of the isolated secondary wall from tracheary elements.

图2—8为扫描电镜下观察到的状分子离体次生壁。

Methods Incommodious bile duct was restored by making gallbladder one (lamella) with cystic artery into half-cannular or cannular gallbladder one (lamella).

方法利用带囊动脉的囊瓣制成半状、状的囊瓣。

In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.

正羽上，羽枝以螺旋形绕著状的羽芽生长，子的一侧接合一起形成羽轴，同时子的另一侧形成新的羽枝脊。