boomyadj.(经济)景气的boomn.繁荣；兴旺；激增；低沉声n.帆杠；吊杆；支臂；尾桁；水栅vi.急速增长；发出低沉声vt.使兴旺；促进boom conditions生意兴隆,市面繁荣boom roadheader悬臂式掘进机boom strut mast悬吊支撑booming economy繁荣的经济boom roadhearder掘进机boom drop-pipe喷杆的下悬[喷]管(喷雾机用的)boomless sprayer无喷管式喷雾器booming business生意兴隆boom hoist cable提升钢丝绳boom support guy挖土机臂吊索