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1·He speaks putonghua quite correctly.

他普通话说得很标准。《新英汉大辞典》

2·He does not speak standard Putonghua.

他的普通话说得不标准。

3·When travelling in Singapore, you can simply speak Putonghua a lot of the time.

在新加坡旅行时，很多时候你可以只说普通话。

4·The official language of China is Putonghua, while the foreigners usually call it Mandarin.

中国的官方语言是普通话，而外国人通常称之为 Mandarin。

5·Putonghua is the mother dialect of Chinese living in northern China and Sichuan Province.

普通话是生活在中国北部及四川省的中国人的母语。

6·Putonghua (or Mandarin), the predominant dialect, is spoken by over 70% of the population and is one of the 6 official languages of the United Nations.

普通话是最普遍的方言，中国70%以上的人口说普通话，普通话还是联合国六种官方语言之一。

7·Putonghua test is a kind of standard referential test.

普通话水平测试属于标准参照性考试。

8·When you come into our school, you must speak Putonghua.

一进 学校，你就要讲普通话。

9·When you come into our school, you must speak Putonghua.

一进学校，你就要讲普通话。

10·These will be the promotion of Putonghua in our school slogan.

这些将成为我们学校推广普通话的宣传口号。