她的举止总是很得体端正。

Tā de jǔzhǐ zǒng shì hěn détǐ duānzhèng.

Her demeanor is always elegant and proper.

在公共场合要保持言行端正。

Zài gōnggòng chǎnghé yào bǎochí yánxíng duānzhèng.

Maintain proper speech and behavior in public places.

请大家端正坐姿，不要趴在桌子上。

Qǐng dàjiā duānzhèng zuòzī, búyào pā zài zhuōzi shàng.

Everyone, please sit properly and don’t lie on the desk.