Until, that is, you hear all the customers speaking Mandarin.

然而，听到所有的顾客说的都是汉语，你才发现并非如此。

youdao

Fluent in reading, writing, speaking Mandarin, and able to speak and write English.

流利的读，写，说普通话；并能说，写英语。

youdao

He had not realized that I was a speaker of Mandarin imitating Hunanese imperfectly and assumed instead that I was a Hunanese speaking Mandarin imperfectly.

他没有想到我是一个说普通话的人在模仿说湖南话说得不地道，而以为我是一个湖南人在模仿说普通话说得不地道。

youdao

It is not unusual to see someone from the Mandarin Service talking to someone from the Urdu Service, both speaking English.

VOA: special.2011.01.12

Four weeks later, he had talked his way (speaking English and Mandarin helped) into a job as John Lone's double.

CNN: From Our Correspondent: Hip Hop Reality

Sorvino is a Mandarin-speaking Harvard University graduate who spent a college year abroad in Beijing.

CNN: PEOPLE

That is something of a problem if you are running a large Chinese-owned business in Mandarin-speaking Taiwan.

ECONOMIST: Tongue-twisters