occupational tax开业许可税occupationaladj.职业的occupational infection职业性感染occupational licensing发放职业许可证occupational melanosis职业性黑变病Occupational stressors职业压力源occupational paralyses[医] 职业性麻痹occupational nystagmus职业性眼球震颤occupational structure职业结构occupational seniority职业资历occupational radiation职业性照射occupational poisoning职业中毒