독일계나 네덜란드계 혈통의 가정에서 할아버지를 이르는 말.
A grandfather, particularly within families of German or Dutch heritage.
예문:
"My opa always told stories about his childhood in Berlin."
"We sent a birthday card to opa in the Netherlands last week."
제2차 세계 대전 중 물가와 임대료를 통제하기 위해 설립된 미국의 연방 기관인 물가 관리국.
The Office of Price Administration, a United States federal agency (1941–1946) established to control prices and rents after the outbreak of World War II.
예문:
"The OPA implemented rent controls to prevent wartime inflation."
"Historians study OPA records to understand the 1940s economy."
이미지를 투사하여 추적할 수 있도록 설계된 제도나 지도 제작용 광학 부속 장치.
An optical plotting attachment used in technical drawing or mapping to project images for tracing.
예문:
"The OPA allows for more accurate transfer of coordinates to the map."
"Check if the OPA is compatible with the current lens system."