The color and lustre, thermochromic temperature and color-recovering time of the products keep constant when the experiment is carried out repeatedly 20 times.
重复进行20次实验，颜料的色泽、变色温度和复色时间保持不变。
The color and lustre, thermochromic temperature and color-recovering time of the products keep constant when the experiment is carried out repeatedly 20 times.
重复进行20次实验，颜料的色泽、变色温度和复色时间保持不变。
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