"金属伸缩软管" can be translated as "metal flexible expansion hose" or "metal retractable hose".
"Metal flexible expansion hose" emphasizes both the flexibility and the ability to expand or contract, which is a key characteristic of such hoses.
"Metal retractable hose" focuses on the hose's ability to retract or extend, which is another relevant feature.
Both translations are accurate and can be used depending on the context and the specific emphasis desired. In technical or engineering contexts, "metal flexible expansion hose" might be more commonly used to describe hoses designed for applications where they need to withstand pressure, temperature variations, and mechanical stress while remaining flexible and expandable.