双面均凹进的；双凹的。

Concave on both surfaces; biconcave.

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在本文中，我们提出了双凹规划问题和更一般的广义凹规划问题。

In this paper, we put forward biconcave programming problem and generalized concave programming problem more generally.

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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.

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