coefficient of opacity

• 不透明系数

coefficient of opacity的用法和样例：

例句

1. Opacity is due to crazes in the resin.
   不透明是因树脂中产生裂纹。
2. A subclass with explicit opacity components should override this method to return a color with the specified alpha.
   一个拥有不透明通道的子类需要重写这个方法来返回指定了透明值的颜色对象。