We are using an array of small LEDs (light emitting diodes) that have been tuned to produce near infra-red light at a particular wavelength.
我们使用的是小型LED阵列(发光二极管)已经调整，以产生在特定波长的近红外光。
We are using an array of small LEDs (light emitting diodes) that have been tuned to produce near infra-red light at a particular wavelength.
我们使用的是小型LED阵列(发光二极管)已经调整，以产生在特定波长的近红外光。
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