对称

• Folds may be gentle and symmetrical, or sharp and asymmetrical .
  褶皱可以是平缓而对称的，也可以是陡峭而非对称的。
• Step edges that are parallel to the planet radius are coated symmetrically .
  与行星径向平行的台阶边缘被对称淀积。
• After each reduction, the remaining equations remain symmetric and banded .
  在每次约化后，余下的方程是保持对称和带状的。
• The rule of combination of symmetry operations is successive performance of them .
  对称操作的组合规则，是逐次地去运用它们。
• The asymmetry factor commences to decrease with increasing absorption coefficient .
  非对称因子随着吸收系数的增加而开始减小。
• The rather messy expression in the brackets can be written in a symmetric form .
  中括号中这个相当凌乱的表达式可以写成对称形式。
• Time reversal invariance is a very useful symmetry in subatomic physics .
  时间反演不变性在亚原子物理中仍然是一种很有用的对称性。
• The transforms of disks and rings and the like will obviously be circularly symmetric .
  圆盘和圆环等的变换式显然将是圆形对称的。
• Particles, such as pi-mesons, requiring symmetric wave functions are called bosons .
  要求对称波函数的粒子，如介子，叫做玻色子。
• A central force is one derived from a potential-energy function that is spherically symmetric .
  中心力是由球对称的势能函数而来的力。