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By using an effective Lagrangian approach, we evaluate the branching ratio of $B^0_s\\rightarrow K^- Z^+_{cs}$ and $B^+\\rightarrow \\phi Z^{+}_{cs}$ via the triangle loop mechanism. The estimated branching fractions of $B^0_s\\rightarrow K^- Z^+_{cs}$ and $B^+\\rightarrow \\phi Z^{+}_{cs}$ are an order of $10^{-4} $ and $10^{-5}$, respectively. 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