随后进入衰退期，释放出中等大小的红外光子或是光子。
They subsequently "de-excite" and emit mid-infrared light particles, or photons.
当黑体变冷的时候，在一定的温度以下，它就不会再发出可见光而是放出红外光子。
When a black body cools down, at some point it no longer radiates light in the visible spectrum, giving off infrared photons instead.
光伏电池通常对光谱中的可见光和紫外线波段的光子受激性最好，但高频红外光子也能激发电流。
Photovoltaic cells are usually most responsive to photons in the visible and ultraviolet parts of the spectrum, but they can also respond to high-frequency infrared photons.
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