对于多数比赛项目而言，门票要1元、2元或3元。

For most events, tickets cost one, two or three yuan.

《柯林斯英汉双解大词典》

此外，追溯不是对于需求所获取的唯一的元信息。

Furthermore, traceability is not the only meta-information to be captured for requirements.

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此层表示并使用元数据，元数据对于将每个层与其邻近的服务层成功分离非常关键。

This layer represents and USES the metadata that is key to the successful decoupling of each layer from its neighboring service layer.

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