双折射的英文：
birefringence
double refraction

参考例句：

All fibers are more or less doubly refractive.
所有纤维都具有程度不同的双折射。

All fibers are more or less doubly refractive
所有纤维都具有程度不同的双折射。

In brief, the birefringence is varied electronically by means of a controlled applied electric field
简言之，用一个受控的外加电场以电子学方法来改变双折射。

A clear moire pattern is obtained only when the model is negligible
仅当模型的双折射效应可以忽略时，才能获得清晰的波纹图案。

birefringence是什么意思：
双折射,双折射率,复折射,二次折射,重折率

birefringence of the cured resin was measured with a senarmont compensator
用塞拿蒙补偿器测定固化树脂的双折射率。

The interrelation between the signs of the birefringence in the planes of symmetry can be deduced from the index ellipsoid
各对称面的双折射符号之间的相互关系，可以从标准椭球体推定。

double是什么意思：
adj. 加倍的；两倍的；双人的；双重的；两面派的
adv. 双重地；两倍地；成双地
n. 两倍；加倍；
v.（使）加倍

to double steal
双盗垒

double steering
双转向

The child birthrate in that area has doubled.
该地区的婴儿出生率已经增加了一倍。

refraction是什么意思：
n. 折光；折射；（眼睛的）折光能力

The bending of the light rays is caused by refraction.
光线的弯曲是由折射造成的。

There is difference in the refractive power of the two eyes.
两只眼睛的屈光能力不一样。

Refraction has been dealt with on page 125.
折射已经在前面156页谈过。