Trooper
来自Big Physics
wiktionary
From troop + -er, from French troupe. The sense of “one who endures adversity” comes from trouper(“member of an acting troupe”) but through assimilation with the sense of “soldier” has come to be usually spelled “trooper”.
etymonline
trooper (n.)
1630s, "soldier in a cavalry troop," from troop (n.) + -er (1). Extended to "mounted policeman" (1858, in Australia) then to "state policeman" (U.S.) by 1911.
