即使是在初高中，数学书也厚达300页。
Even in middle and high schools, the math book can be 300 pages.
科学家们一致认为，这一情境中的关键推手是南极西部的冰层，这是一块跟巴西（面积）差不多大小的冰原，厚达7000英尺。
Scientists agree that the key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is as much as 7000 feet thick.
Fairley在书中用厚达四十页的测试章节说明。
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