Bare-metal programming is a term for programming that operates without various layers of abstraction or, as some experts describe it, "without an operating system supporting it."
Example: A: I made a nice motor controller with a STM32 MCU. B: Interesting, what OS did you use? A: No OS, bare metal.
The informal Chinese word for this
bare metal seems to be
Although this word is widely used and understood among the programming community, I find it hard to use on a more formal occasion.