求翻译：- Allowance for sales returns is determined based on the prior return experience and estimated twice a year (1st half / year end).是什么意思？

待解决

悬赏分：1 - 离问题结束还有

- Allowance for sales returns is determined based on the prior return experience and estimated twice a year (1st half / year end).

问题补充：

匿名	2013-05-23 12:26:38 -销售返回津贴确定基于返回经验和估计一年两次 (1 半 / 年结束）。

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