改变半导体材料的构成可以改变电子能量释放的多少，从而改变光的颜色。
By changing the composition of the semiconductor materials, it is possible to determine the amount of energy given up by each electron, and hence the light's colour.
依靠轻微得改变晶体的结构，利用电流的改变，当晶体改变时，光的颜色也会相应改变。
By changing the structure of such a crystal slightly, using an electric charge, the colour of the light reflected by that crystal will change too.
新钞增加了新的特征，如晃动钞票时颜色会改变的全息图案，迎光可见的纵向水印条。
The new notes incorporated additional features, such as holograms that change color when the note is tilted, and vertical watermark bars that become visible when the note is held into light.
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