这个社区在垃圾分类方面做得很好，被当成全市的示范。

Zhège shèqū zài lājī fēnlèi fāngmiàn zuò de hěn hǎo, bèi dàngchéng quánshì de shìfàn.

This community does a good job in garbage sorting and has been regarded as a model for the whole city.

老师先给大家做了一次示范，然后才让我们自己练习。

Lǎoshī xiān gěi dàjiā zuò le yí cì shìfàn, ránhòu cái ràng wǒmen zìjǐ liànxí.

The teacher first gave everyone a demonstration, and then let us practice on our own.

父母的言行往往会对孩子起到示范作用。

Fùmǔ de yánxíng wǎngwǎng huì duì háizi qǐdào shìfàn zuòyòng.

Parents’ words and actions often play a demonstrative role for their children.