批评者还指出，在中生代期间，浅海通道曾多次从陆地退回，又向陆地前进。
Critics also point out that the shallow seaways had retreated from and advanced on the continents numerous times during the Mesozoic.
这条路线将使人类能够在大陆冰川融化之前进入美洲南部地区。
This route would have enabled humans to enter southern areas of the Americas prior to the melting of the continental glaciers.
这些城市象我们现在的城市一样，在相同的领域前进着，不管这些陆地的形状是多么的不同。
These cities grew in approximately the same places as our cities do now, however different the shape of the continents was.
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