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.
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