vocational work；professional work； business；
钻研业务 diligently study one's profession
恢复正常业务 resume normal business
业务范围 scope of business
业务能力 professional ability (or proficiency)
业务水平 professional skill；vocational level;
业务协定 business agreement;
业务学习 vocational study
业务知识 professional knowledge
业务尖子 top-notch professional
个人认为：
口语中说到某项业务（服务）时可以用service
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