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We study the threshold enhancement effects of baryon--antibaryon systems in $J/\ensuremath{\psi}$ decays at BES using parity $P$, charge conjugation $C$, and flavor $\mathrm{S}\mathrm{U}(3)$ symmetries. The $P$ and $C$ symmetries restrict the $p\overline{p}$ in $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}p\overline{p}$ to be in a state with $C=+1$, while the $p\overline{p}$ in $J/\ensuremath{\psi}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}p\overline{p}$ to be with $C=\ensuremath{-}1$. …