受激吸收是处于低能级El的原子，受到外来光子的激励下，在满足能量恰好等于低、高两能级之差ΔE时，该原子就吸收这部分能量。
速率方程表征的是原子的自发辐射、受激辐射和受激吸收几率的基本关系，是进行理论计算的根本；
The rate equation theory researches the basic relation of the atomic spontaneous emission, stimulated emission and stimulated absorption, and it is the fundamental theoretical calculations.
分别考虑了吸收、自发辐射和受激辐射诸情况。
The absorption, spontaneous emission and stimulated emission are discussed respectively.
在热介质中，受激的热胶子发射降低部分子的能量，而热吸收增加部分子的能量，其净贡献导致部分子能量损失的减少。
In the thermal medium, the stimulated thermal gluon emission reduces while absorption increases the parton's energy. The net contribution result in a reduction of the parton energy loss.
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