纠正这种偏差是困难的，因为它需要了解产品构成的详细信息。
To correct for that bias is difficult because it requires detailed knowledge of how products are put together.
提供一种下达订单的方法。 每个订单总是由5种不同产品构成。
Provide a method for creating an order. An order will always consist of 5 different products chosen by the user.
附加产品在产品构成中的作用越来越重要，附加产品的性质类似于期权。
Additional production plays an increasingly important role in marketing, with the character similar to options.
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