“人为地”的英语？

饭菜价格常常被人为地抬高.The prices of meals are often artificially inflated.他们一直人为地使糖的价格居高不下，以此为公司牟利。They have kept the price of sugar artificially high and so fattened the company's profits.买主们竞相投标,往往人为地提高价钱.The buyers bid ag...