travelling portal jib crane

例句：

1. 1. The travellingportal jib crane is a crucialcomponent of the construction site safety system.
   旅行门户起重机是施工现场安全系统的关键组成部分。
2. 2. Thetravelling portal jib crane was usedto lift heavy loads during construction.
   旅行门户起重机在施工过程中被用来举起重物。
3. 3.The travelling portal jib crane wasdesigned to be lightweight and easy to maneuver, making it ideal for usein confined spaces.
   旅行门户起重机设计轻便且易于操控，使其非常适合在狭小空间中使用。