1. A machine for hoisting and moving heavy objects by means of cables attached to a movable boom. 
   起重机一种用连在活动架上的缆绳举起和移动重物的机器
2. A machine for hoisting and moving heavy objects, consisting of a movable boom equipped with cables and pulleys and connected to the base of an upright stationary beam. 
   悬臂起重机提升和移动重物的机器，它由一个带有缆绳和滑轮的可移动的、并与一根由向上静止横梁的底座连接的起重杆组成
3. Communication wires and cables 
   通信线缆
4. Market sales begin to boom.  
   四、市场销售开始转旺。
5. The boom of a derrick. 
   人字形起重机的桁

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