更改

\begin{aligned}

\begin{aligned}

EI &= \frac{1}{N}\cdot \sum_{i=1}^N\left(P_i\cdot \log P_i - P_i\cdot\log \bar{P}\right)\\

EI &= \frac{1}{N}\cdot \sum_{i=1}^N\left(P_i\cdot \log P_i - P_i\cdot\log \bar{P}\right)\\

&=\underbrace{-\langle H(P_i)\rangle}_{确定性项}+\underbrace{H(\bar{P})}_{非简并性项}

&=\underbrace{-\langle H(P_i)\rangle}_{Determinism}+\underbrace{H(\bar{P})}_{Non-degeneracy}

\end{aligned}

\end{aligned}

</math>

</math>