1. They expressed their dissent from official policy . 他们对官方的政策表示出异议。
2. Can you give me a copy proof(official notice) for case ? 你能给我一份证明（官方通知的情况下）？
3. A senior railway official ruled out sabotage, saying a faulty track was believed to have caused the crash. 一个年长的铁路官员排除破坏的可能，认为这次事故是出轨道故障引起的。
英英解释
n.
1. a worker who holds or is invested with an office
2. someone who administers the rules of a game or sport adj.
1. having official authority or sanction
2. of or relating to an office
3. verified officially
4. conforming to set usage, procedure, or discipline
5. (of a church) given official status as a national or state institution
