Bad: Sometimes a schema indicates that a data item is optional when some other part of the system downstream fails without the data. Here is an optional element in XML schema.

不好的方法：有时候模式中会指示数据项为可选，但系统中其他的部分却可能因为这部分数据的缺失而失败。

youdao

Unfortunately, traditional collaborative filtering algorithm does not consider the problem of item's multiple contents and often leads to bad recommendation when item has multiple contents.

但由于传统的协同过滤算法没有考虑项目多内容问题，存在项目多内容情况时推荐质量较差。

youdao

Unfortunately, traditional collaborative filtering algorithm does not consider the problem of item's multiple contents and often leads to bad recommendation when item has multiple contents.

但由于传统的协同过滤算法没有考虑项目多内容问题，存在项目多内容情况时推荐质量较差。

youdao