To date the animals' slide to extinction, the scientists examined sediment cores from a lake in Indiana.

为了从时间上定位这些动物走向灭绝的过程，科学家检测了印第安那一片湖泊中的沉积物。

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To date the animals' slide to extinction, the scientists examined sediment cores from a lake in Indiana.

为了从时间上定位这些动物走向灭绝的过程，科学家检测了印第安那一片湖泊中的沉积物。

youdao