pro rata/ˌprəu ˈrɑ:tə; pro`rɑtə/ adj, adv (fml 文) proportional(ly) 成比例（的） If production costs go up, there will be a pro rata increase in prices/prices will increase pro rata. 若生产成本增加, 则价格也要相应提高.
牛津英汉双解词典