English is the leading international language.

英语是主要的国际语言。

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Some nations use English as their official language, performing the function of administration; in others it is used as an international language for business, commerce and industry.

一些国家用英语作为官方语言，并用它履行行政职能；而在其他国家，它被用作商业、贸易和工业的国际通用语言。

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At sea English is the international language of communication.

在海上，英语是一种国际交流的语言。

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But his expert knowledge of the music and its performers helped make jazz an international language.

VOA: special.2009.01.30

He saw that English was becoming an important international language.

VOA: special.2009.10.16

It says the test measures the language skills of people working in an international environment.

VOA: special.2009.01.15

French was once the nearest thing (since Latin) that Europe had to an international language.

ECONOMIST: Globalisation through French eyes

His idea carries the quixotic whiff of Esperanto, the international language that failed to become mainstream.

BBC: Could a new phonetic alphabet promote world peace?

France, for example, never imagined that French would cease to be the international language of diplomacy and business.

FORBES: Magazine Article