作为开发者或架构师，你应该在后备箱里为二者都留出位置。
As a developer or an architect, you need to have both in your back pocket.
根据保护速度曲线用红外激光位置传感器的跟踪测量功能实现速度的后备保护。
According to the protective speed curves, the tracking measuring function of infrared laser position transducer is applied for back-up protection of travel speed.
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