拆迁: to demolish a building and relocate the inhabitants...
作废: to become invalid, to cancel, to delete, to ify...
变换: to transform, to convert, to vary, to alternate, a transformation...
了: (modal particle intensifying preceding clause), (completed action marker), to know, to understand, to know, clear, look afar from a high place...
行动: operation, action, to move about, mobile...
报名: to sign up, to enter one's name, to apply, to register, to enroll, to enlist...
后台: backstage area, behind-the-scenes supporter, (computing) back-end, background...
难度: degree of difficulty...
告知: to inform...
竟敢: to have the impertinence, to have the cheek to...
