loop back test

例句：

1. 1. The engineer performed a loop back test on the circuit to ensure it was functioning correctly.
   工程师对电路进行了回环测试，以确保其正确工作。
2. 2. During the development phase, the team conducted a loop back test to identify any potential issues with the software.
   在开发阶段，团队进行了回环测试，以识别软件中可能存在的任何潜在问题。
3. 3. The loop back test helped to confirm that the new system would work seamlessly with the existing infrastructure.
   回环测试帮助确认了新系统与现有基础设施的无缝对接。