two-fold symmetry

It is well known that symmetry breaking and quark confinement are two open problems in theoretical physics.

众所周知，对称性破缺与夸克禁闭问题是理论物理中悬而未决的两大疑难。

The thermal decomposition of the precursor includes two steps, the first is R3: spherical symmetry there dimensional phase inter-surface reaction with the reaction order of 3. The second is the simply second-order reaction.

碱式碳酸锌的热分解为两步反应过程，第一步为R3，即球形对称三维相界面反应；第二步为F2，即为简单二级反应。

It is found that asymmetry doping at the ribbon edge causes the the spin polarization effect, leading to the current split of two spins, and that under the AF state the heterojunction with symmetry doping shows the one direction conductivity and P-N junction effect.

研究发现，边缘的不对称性掺杂引起了自旋极化效应，使自旋电流发生分裂；而对称性掺杂的异质结在反铁磁构型下出现了明显的单向导电性，显示出P-N结效应。

Deformation Due to Time Harmonic Sources in Micropolar Thermoelastic Medium Possessing Cubic Symmetry With Two Relaxation Times

具有立方对称性及两个弛豫时间的微极热弹性介质中调和时间源引起的变形

Making Big Spherical Symmetry GRIN Micro-Sphere by Suspension-Diffusion-Copolymerization; Preparation of Large Particle Size PMMA Microspheres by Two Step Swelling Process

悬浮扩散共聚法制备大粒径球对称梯度折射率微球