trailorn.预告片trailn.踪迹；小径；尾；一系列vi.拖；落后于vt.追踪；拖拽；尾随trailable switch machine挤脱式转辙机trail of the development发展轨迹trailing edge of a brush电刷后沿Trailing Edge Range Bias后沿距离偏压trail-blazing pioneers开路先锋trail-marking pheromone标迹信息素trailling point crossover背向渡线trailed-cultivator plow牵引式中耕机Trail of the Pink Panther粉红豹再度出击trailed rotary cultivator牵引式旋耕机