a single item怎么翻译?

profit reserved for a single item：单项留用的利润 单项留用的利润
例句与用法A bar is then separated into segments so that each segment represents a single item of the corresponding set.
一条柱形随后被分成了几段,每一段代表了相应的集的单个项.
The process a single item goes through from its raw material stage to its final distribution to the consumer.
一件物品,从原材料到最终分销到客户的过程.
These real estate business is not simply the pursuit of a single item of profit margins,stressed the rapid development and sales,asset turnover and efficient by enhancing return on equity.
这些地产企业不单纯追求单个项目的利润率,强调快速开发和销售,借高效的资产周转率提升净资产收益率.