Because in the competition process, some species might distinct, which means that xi(t) might converge to 0 as long as t !1.

• 而在物种竞争的过程中，物种i可能灭绝，在这种情况下xi(t)将逐渐趋于0，而其扩大函数通常依赖于xi(t)，并且随xi(t)趋于0而逐渐趋于0。