单词	Hetu and Luoshu
释义	Hetu and Luoshu 河图洛书
随便看	operating lamp operating-lamp operating language operating laparoscope operating laryngoscope operating laryngoscopy operating latitude operating lease operating leases operating leasing operating ledger operating length of railway operating lens operating level operating level accelerating pump operating lever operating leverage operating leverage ratio operating lever articulation operating lever connecting yoke Operating lever for reverse valve operating lever hook operating lever latch knob operating lever lock operating lever spring foot