This works:
如此:
plot(t, pa_iso, '-rs', 'MarkerEdgeColor', 'k', 'MarkerFaceColor', 'r', 'MarkerSize', 5);
plot(t, pc_iso, '-gs', 'MarkerEdgeColor', 'k', 'MarkerFaceColor', 'g', 'MarkerSize', 5);
plot(t, pa_comp, '-bs', 'MarkerEdgeColor', 'k', 'MarkerFaceColor', 'b', 'MarkerSize', 5);
plot(t, pc_comp, '-ms', 'MarkerEdgeColor', 'k', 'MarkerFaceColor', 'm', 'MarkerSize', 5);
plot(t, pa_iso, '-rs', 'Mar