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An energy-efficient routing protocol with static clustering and dynamic structure (ERP-SCDS) is proposed in this paper by utilizing virtual points in a corona-based wireless sensor network. To avoid a deadlock when old cluster heads die, next-round cluster heads are selected in advance. Besides, a simple relay node selection mechanism is further designed for ERP-SCDS. Illustrated by simulation results, the superiority of ERP-SCDS over some closely related protocols in the literature is successfully shown.