Ocean sediments presented a much more complete geologic record of the Pleistocene than continental glacial deposits did.
相比于大陆冰川沉积物，海洋沉积物提供了更完整的更新世时期的地质记录。
2
They could trace the growth and shrinkage of continental glaciers, even in parts of the ocean where there may have been no great change in temperature—around the equator, for example.
他们可以追踪大陆冰川的生长和收缩，即使是在温度变化不大的海洋区域——比如，赤道附近。
3
When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it.