纸张尺寸(131/2X241/2英寸)
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sheet and half cap
单张半盖
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But the volume of the Martian north polar cap is less than half that of the Greenland ice cap, and about four percent of the Antarctic ice sheet.
BBC: By BBC News Online Science Editor Dr David Whitehouse
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