Final answer:
In computer science, each stage in a data transformation pipeline may contain expressions or operations to transform a collection of data.
Step-by-step explanation:
In computer science, the term 'stage' typically refers to a step or phase in a process. If the question is related to a programming or data processing context, then each stage could represent a step in a data transformation pipeline.
For example, in data science, there is a concept called Extract-Transform-Load (ETL), where data is collected from various sources, transformed (cleaned, processed, aggregated, etc.), and then loaded into a target system. Each stage in the ETL pipeline may have expressions or operations that manipulate the data.
In this context, the collection can be considered as a set of data that needs to be transformed, and each stage would contain expressions or code to perform the necessary transformations.