3 sentences

1. 这件墨迹被视为国宝。

   zhè jiàn mò​jì bèi shì​wéi guó​bǎo.

   This piece of calligraphy is regarded as a national treasure.

   Source: Dong Chinese Dictionary

2. 大熊猫是中国的国宝。

   dà​xióng​māo shì Zhōng​guó de guó​bǎo.

   Giant pandas are China's national treasure.

   Source: Dong Chinese Dictionary

3. 大熊猫是中国最著名的国宝。

   dà​xióng​māo shì Zhōng​guó zuì zhù​míng de guó​bǎo.

   The giant panda is China's most famous national treasure.

   Source: Dong Chinese Dictionary