  The flavor asymmetry of the nucleon sea, i.e., the excess of $d\bar{d}$
quark-antiquark pairs over $u\bar{u}$ ones in the proton can be explained by
several different models; therefore, it is a challenge to discriminate these
models from each other. We examine in this Letter three models: the balance
model, the meson cloud model, and the chiral quark model, and we show that
these models give quite different predictions on the sea quark contents of
other octet baryons. New experiments aimed at measuring the flavor contents of
other octet baryons are needed for a more profound understanding of the
non-perturbative properties of quantum chromodynamics (QCD).
