,x n)is a return trajectory of f∈C 0(I),υ∈F(f)n,and P contains k(1) centripetal points relative to υ.
设P =(x0 ,x1,… ,xn)是f∈C0 (I)的一个返回轨道 ,υ∈F(f)n[P],P包含k( 1)个关于υ的向心点 。
As an important communicative strategy and effective cooperative device,back-channeling is essential to successful communications.
"渠道返回"(back-channeling)作为一种很重要的交际策略无疑对于成功的交际有着十分重要的意义。