The mechanism of Li and Pagels is used to discuss the $S$-wave nonleptonic decays of mesons and baryons. It implies that the decays ${\Sigma }^{+}\to n{\pi }^{+}$ and $K^{+}\to {\pi }^{+}{\pi }^0$ do not occur and thus the $\Delta I=\frac{1}{2}$ rule and the Lee-Sugawara relation hold. Moreover, it also yields a relation between the $\frac{F}{D}$ ratio for nonleptonic hyperon decays and the $\frac{F}{D}$ ratio for the semileptonic decays.

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