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Ice cores and samples revealed that both ice shelves and green icebergs contain a layer of bubbly glacial ice and a layer of bubble-free sea ice.请问这句话是什么意思？
1 ice shelves contain a layer of bubbly glacial ice and a layer of bubble-free sea ice，and green icebergs contain a layer of bubbly glacial ice and a layer of bubble-free sea ice
2 ice shelves contain a layer of bubbly glacial ice，and green icebergs contain a layer of bubble-free sea ice |
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发表于 2012-11-10 03:23:14
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