海洋沉积物中浮游生物的这种变化标志着白垩纪和第三纪的分界线。
This change in plankton found in marine deposits is what marks the boundary between the Cretaceous and the Tertiary.
作为曼哈顿岛东区和西区分界线的地标性主要大道，第五大道始终都是纽约时尚生活的一个标志。
A major landmark avenue that divides the island of Manhattan into the West Side and the East Side, Fifth avenue has always been a symbol of the ritzy life of New York.
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