Janus
/ˈdʒeɪnəs/- Roman Mythology an ancient Italian deity, guardian of doorways and gates and protector of the state in time of war. He is usually represented with two faces, so that he looks both forwards and backwards.【罗马神话】杰纳斯（古意大利神、门神和战时国家的守护神, 具有两张脸, 故可同时察看前后两个方向）。