短语词组短語back trace buffer 重設廻溯追蹤緩沖區write -back buffer 寫廻緩沖single back buffer display 單後備緩存顯示Unified Back Buffer 一後備緩和沖突器Windowed SwapBuffers Destroys Back Buffer 窗口緩沖替換最後緩沖 返回 back buffer