The ions pass from the graphite to the phosphate through an intervening electrolyte while the electrons make the journey via an external circuit that allows them to do useful work.
离子通过中间的电解液从石墨极流向磷酸极而电子则通过外部的电路流动，由此作有用功。
2
In addition, the transport layer allows IMS devices to make and receive calls to and from the PSTN network or other circuit-switched networks via the PSTN gateway.