冰河期前的

例句：

1. 1. The climate during the pre-glacial period was very different from today's.
   冰河期前的气候与现在的大相径庭。
2. 2. Pre-glacial sedimentary rocks are often found in areas that were once covered by ice.
   冰河期前的沉积岩通常在曾经被冰层覆盖的地区被发现。
3. 3. The discovery of these rocks provides important clues about the history of our planet before the onset of glaciation.
   这些岩石的发现为我们提供了关于地球在冰河期到来之前历史的重要线索。