optical grade

• 光度； 光级

optical grade的用法和样例：

例句

1. The astigmatism and the grade of astigmatism decreased with age increase.
   随年龄增长，散光逐渐减少，散光度逐渐减低。
2. The glucuronides were then first methylated, then acetylated and optical rotations were tabulated.
   葡萄糖醛酸甙然后首先甲基化，然后乙酰基化和旋光度做表。