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occur [ə'kɜ:] v
gen.	出现; 有; 被发现; 被想到 to (to)
econ.	存在
vet.med.	发生
occurs v
earth.sc.	发生; 出现
tech.	重现

occurred : 97 phrases in 19 subjects

Artificial intelligence	2
Aviation	2
Business	8
China	12
Commerce	4
Economics	9
Explosives and Explosive Ordnance Disposal	8
Foreign trade	3
General	21
Hydroelectric power stations	1
Law	1
Lighting other than cinema	1
Marketing	1
Mathematics	4
Medical appliances	1
Project management	3
Scientific	8
Securities	1
Technology	7