目的：评价离体牙在四种常见保存液中颜色的变化。
Objective: to evaluate the color change of extracted tooth in four routine solutions.
翡翠颜色的变化多端，使得对颜色的评价十分困难。
It is very difficulty to appraise the color's quality, because of the various changes.
翡翠颜色的变化多端，使得对颜色的评价十分困难。
It is very difficulty to appraise the color's quality, because of the various changes.
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