official business

基本解释

Mandelson is in Paris on Tuesday morning on official business.
星期二的上午，曼德尔森由于公务到达巴黎。
The BEC exam tests one’s specialized vocabulary needed to draft official business letters, as well as spoken language for telephone communications.
BEC 测试考查人们起草官方商务信件所必需的专业词汇以及电话交谈的口语能力。
All our employees who have access to, and are associated with the processing of personal data, are obliged to respect the confidentiality of official business matters, including personal data.
责成能存取个人数据以及与处理个人数据有关的所有雇员遵守官方公务的保密原则，包括对个人数据保密。

Ney's office also says he had official business, too, visiting members of the Scottish parliament.
NPR: Scrutiny Falls on Those Close to Lobbyist
In theory, the president is entitled to use it at taxpayers' expense only when he is on official business.
ECONOMIST: Lexington
In addition, nothing in the order prohibits transactions for the conduct of the official business of the Federal Government by employees, grantees, or contractors thereof.
WHITEHOUSE: The White House