He is on business now.

他现在在出差。

youdao

He is on business. We couldn't find him at his office.

他出差了，我们在办公室里没找到他。

youdao

There is an unmistakable note of nostalgia in his voice when he looks back on the early years of the family business.

在他回忆早年的家族企业时，他的声音里带有一种确定无疑的怀旧语气。

《柯林斯英汉双解大词典》

In theory, the president is entitled to use it at taxpayers' expense only when he is on official business.

ECONOMIST: Lexington

Roubini's views on global economics issues are widely cited by the media, and he is a frequent commentator on various business news programs.

FORBES: Next Week's Guest: Nouriel Roubini

He is a frequent writer on business and technology topics and has shared his thoughts and expertise at many industry events throughout the years.

FORBES: Connect