因此，化石是识别地球历史上特定时期的标志。
Fossils are thus identifying markers for particular periods in Earth's history.
因此，颜色不能作为钾长石鉴定时的特征性标志。
Therefore, the color can not be used as a characteristic marker of potash feldspar.
朱迪斯·巴特勒在《性别麻烦》一书中认为性别即是“表演”是人们在特定时期所戴的标志(面具)。
In gender Trouble, Judith Butler views gender as "performance", that is, a set of signs (masques) one puts on at a given time.
奁的历史代表了中国古代妇女化妆用品、用具的演进，代表了一定时代的装饰文化，也代表了一定历史时期的生产力水平和独特的审美崇尚，它是中国文化史链条上的隐性标志。
The evolution of the dressing case represents the decorative culture of the times. At the same time, it also stands for productive forces and aesthetic standards in the periods of history.
奁的历史代表了中国古代妇女化妆用品、用具的演进，代表了一定时代的装饰文化，也代表了一定历史时期的生产力水平和独特的审美崇尚，它是中国文化史链条上的隐性标志。
The evolution of the dressing case represents the decorative culture of the times. At the same time, it also stands for productive forces and aesthetic standards in the periods of history.
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