图书馆有很多规定，请大家安静。

Túshūguǎn yǒu hěn duō guīdìng, qǐng dàjiā ānjìng.

The library has many rules, so please be quiet.

学校规定上课不能玩手机。

Xuéxiào guīdìng shàngkè bù néng wán shǒujī.

The school rules say you can’t use your phone in class.

如果大家都遵守交通规则，路会更安全。

Rúguǒ dàjiā dōu zūnshǒu jiāotōng guīzé, lù huì gèng ānquán.

If everyone follows the traffic rules, the roads will be safer.