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jib boom [ˌʤɪ'buːm]
archit. 顶部附加臂; 飞臂
tech. 机臂; 后斜帆桁; 起重机旋臂; 起重杆; 起重臂; 挺杆; 辅助延伸臂
jib boom: 5 phrases in 2 subjects
Metallurgy3
Technology2