campaign trail
noun [ C usually singular ] uk/kæmˈpeɪn ˌtreɪl/ us/kæmˈpeɪn ˌtreɪl/
（在不同地方开展的）一系列竞选活动
a series of planned events in different places taken part in or given by a politician who is trying to be elected
She went on the campaign trail around the Southern states. 她去南方各州参加了一系列的竞选活动。