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arm crane
auto.	悬臂式起重机吊车
construct.	悬臂式起重机
hydroel.st.	悬臂起重机
shipb.	挺杆起重机
tech.	挺杆式起重机; 挑杆起重机; 横臂起重机; 悬臂吊机; 悬臂吊车
wind.	悬臂式起重机

arm crane: 12 phrases in 3 subjects

Automobiles	2
Hydroelectric power stations	4
Technology	6