双凹 biconcave
concavo-concave
- 果三角型,双凸,或者双凹的瘦果;
Fruit a trigonous, biconvex, or biconcave achene; - 红血球呈现球状,而不是正常细胞的双凹圆盘状。
The red cells have a spherical rather than the biconcave-disk shape of the normal red cell. - 特殊双凹内管与双凸乌司调整结构,能达到简易快速调整效果。
The special two concave inner tube and two convex wusi structure, could make the quick-adjusting result.
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