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Wireless sensor networks (WSNs) are often deployed in hostile environments for specific applications from mobile objects monitoring to data collecting. By eavesdropping the sensor nodes' transmissions and tracing the packets' trajectories in the WSNs, an adversary can capture the location of a source or sink eventually. Thus, the location privacy of both source and sink becomes a significant issue in WSNs. Previous research only focuses on the location privacy of the source or sink independently. In this paper, we address the importance of location privacy of both source and sink and propose four schemes to protect them simultaneously. Simulation results illustrate the effectiveness of our proposed schemes.