Powder accumulation on the sheet 喷粉堆积在样张上
sheet accumulation
表积累
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Scientists compare annual accumulation to the volume of ice lost to sea each year to calculate the ice sheet's overall mass balance and its contribution to sea level rise.
ENGADGET: NASA's GROVER eco-rover to examine Greenland's ice sheet (video)
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