de facto

Although English is not the legal national language, it is the de facto language of business.

(Chinese) 虽然英语不是法定的国家语言，但它是事实上的商务语言。

The military general became the de facto leader of the country after the government fell.

(Chinese) 政府倒台后，这位将军成为了该国事实上的领导人。