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=== 异质平均场理论 ===
=== 异质平均场理论 ===
\begin{equation}
\left\{
\left\{
\begin{aligned}
\begin{aligned}
&\frac{ds_k(t)}{dt}=-k\beta s_k(t)\theta_k(t)+\gamma i_k(t),\\
&\frac{ds_k(t)}{dt}=-k\beta s_k(t)\theta_k(t)+\gamma i_k(t),\\
&\frac{di_k(t)}{dt}=k\beta s_k(t)\theta_k(t)-\gamma i_k(t).\\
&\frac{di_k(t)}{dt}=k\beta s_k(t)\theta_k(t)-\gamma i_k(t).\\
\end{aligned} \right.
\end{aligned}
\right.
\end{equation}
\end{equation}