“…In detail, the interval [−δ,0] is decomposed into some time‐delay subintervals, such as [−δ i ( t ),0], [−δ( t ),−δ i ( t )], [−δ i ( t )−δ j ,−δ( t )] and [−δ,−δ i ( t )−δ j ] for i , j =1,2, i ≠ j . It is clear that the above subintervals reflect the evolution process of additive TDs more precisely, which is more realistic than References . The subintervals are then employed to estimate the bound of and in different ways, respectively, so that the information about additive TDs is taken into account more sufficiently.…”