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Mobile ad hoc networking technologies have increasingly been applied to civilian applications, and the requirements of providing better services in mobile ad hoc networks (MANETs) are growing, accordingly. However, the natures of MANET, which are highly dynamic topologies and possibly high bit error rate of links, raise many challenges in developing efficient, reliable and scalable protocols for MANETs. Especially, routing protocols for MANETs are significantly different from traditional routing protocols. In this paper we propose a threshold-based hybrid routing protocol that supports a mobile node to selectively run the routing protocol based on its velocity. In addition, the proposed routing protocol and several typical MANET routing protocols are theoretically analyzed.