俄罗斯官员禁止反腐败活动家竞选总统

formally - adv. done in an official and public way

grassroots - adj. made up of the ordinary people in a society or organization : the people who do not have a lot of money and power

procedure - n. a series of actions that are done in a certain way or order

canvass - v. to talk to the people in an area in order to get them to support a candidate

inefficient - adj. not capable of producing desired results without wasting materials, time, or energy