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讨论了形如x′(t)=f(x(t),x(t-τ1(t)),...,x(t-τm(t)),y(t),y(t-τ1(t)),...,y(t-τm(t)))和εy′(t)=g(x(t),x(t-τ1(t)),...,x(t-τm(t)),y(t),y(t-τ1(t)),...,y(t-τm(t)))(0