更多frustule例句

1. Each half of a frustule is called a valve, and the line at which these valves meet is called the suture.
2. In many cases I believe that each half-frustule becomes coated with a new entire cell-wall, with its siliceous valves.
3. Frustule cylindrical; zone with longitudinal rows of fine puncta.
4. Processes very large, cylindrical, placed obliquely and inclined by the torsion of the frustule.
5. Frustule broad, with rounded angles; septa curved; valve ovate, inferior apex produced.