兑现

All of the licks, riffs, and methods in this arsenal have been meticulously created and organized to give you the best possible learning experience.

所有的舔，药材和方法，这在阿森纳队已经创造了精心组织，并给您最好的学习经验。

For many years researchers have been trying to develop a synthetic material with the same light-scattering properties as an opal, by etching patterns into various materials.

D 选项，第一段提到是发明的塑料可以用于制作油漆的闪光替代品，而不是蛋白石本身。