affair

The politician's successful career was ruined when the press exposed his long-term affair.

(Chinese) 当媒体曝光这位政客长期的婚外情时，他成功的职业生涯毁于一旦。

She was heartbroken to discover that her husband had been having an affair for over a year.

(Chinese) 她心碎地发现丈夫已经出轨一年多了。

The Ministry of Foreign Affairs is responsible for the country's relations with other nations.

(Chinese) 外交部负责国家与其他国家的关系。

How I choose to spend my free time is my private affair and none of your concern.

(Chinese) 我选择如何度过空闲时间是我个人的私事，与你无关。