在销售之前的任何时刻，只能估计出销售商品或劳务的基本价值。

At any time prior to sale, the ultimate sales value of the goods or services sold can only be estimated.

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例如，美元或任何其他货币单位代表着一个价值单位，即它反映控制商品和劳务的能力。

For instance, the dollar, or any other monetary unit, represents a unit of value; that is, it reflects ability to command goods and services.

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礼物之定义包括任何有货币价值之项目，例如商品、优惠券、酒店住宿、工作后之饮食、免费膳食、机位升级等。

In this context, "a gift" includes items with monetary value such as merchandise, tickets vouchers, hotel accommodations, after business-hours meals, free meals, airline upgrades, etc.

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