八一 bā yī — August 1st (PLA Army Day) 八一 bā yī Characters: 八 · 一 Definitions August 1st (PLA Army Day) Examples 八一建军节这天,军营向社会开放。 On Army Day, the military camp is open to the public. 他在八一前夕回到了老部队。 He returned to his old unit on the eve of August 1st.