据估计，全年销售收入的很大一部分，来自在圣诞节前圣诞大采购的一个多月里。
It is estimated that a major percentage of the annual yield of revenue from sales is generated during the month or more of intense Christmas shopping before Christmas.
美国游戏公司的很大一部分收入来自在海外销售游戏。
U. s. game companies derive a major part of their revenue from sales of games overseas.
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