We start at this lower energy state and go up that means we need to absorb a photon, we have to take in energy.
我们从一个低能级开始，到一个高能级去，这意味着需要吸收一个光子，我们要获得能量。
We start at this lower energy state and go up that means we need to absorb a photon, we have to take in energy.
我们从一个低能级开始，到一个高能级去，这意味着需要吸收一个光子，我们要获得能量。
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