双面均凹进的；双凹的。
一根两端有把手的绳抖动一个底面圆形、侧面双凹的木质物体转动或抛起。现在，有很多人在公园里玩这个传统的体育项目。
The Chinese yo-yo is a sport from China consisting of two equally-sized discs connected with a long axle. Nowadays, this traditional sports that many people play it in the park.
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.
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.
碱性玄武岩的双凹型REE配分模式是熔体与单斜辉石、石榴石达到化学平衡或近于化学平衡的结果；
The double-concave shape of REE patterns of the alkali basalt show that the basalt melt had reached equilibrium or quasi-equilibrium with the garnet and clinopyroxene megacrysts.
用有限元方法，对双圆弧弧齿锥齿轮沿齿长方向齿根应力进行了计算。通过应力计算结果的分析，得出了凸、凹两齿侧应力沿齿长的分布规律。
Through the calculation of the finite element method(FEM) models for double circular arc profile spiral bevel gear, the stress changing pattern along the length of the tooth is obtained.
南部陡坡带双河—赵凹—安棚一带是勘探大仓房组的有利地区。
The belt of Shuanghe-Zhaoao-Anpeng in the steep slope th the south is considered as a favourable area in Dacangfang formation.
推导了进入双点啮合区的法面啮合角公式，采取了独特的剃齿刀修形方式，从设计和修形上下功夫杜绝剃齿中凹的产生。
And the normal engagement angle of approaching double-point tooth area is deduced. The special dressing method of shaving cutter has been adopted.
肌肉拉勾为曲状双头结构，其两端部的撑开器为内凹的曲面板状。
The muscle pulling hook is curved double-head structure, and the expanders for the two end parts are concave curved plates.
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 。
This thesis presents the combination of the stochastic programming and generalized goal programming.
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 。
This thesis presents the combination of the stochastic programming and generalized goal programming.
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