General meaning:
* 站起来 (zhàn qǐ lái): This is the most common and versatile way to say "stand up." It literally means "stand up (from a sitting position)."
More specific meanings:
* 站直 (zhàn zhí): This means "stand straight" or "stand up straight."
* 站起来 (zhàn qǐ lái) 站好 (zhàn hǎo): This combination means "stand up and stand properly" or "stand up straight."
* 起立 (qǐ lì): This is more formal and often used in situations like meetings or ceremonies. It means "to stand up" in a formal setting.
* 站着 (zhàn zhe): This means "standing" and can be used to describe someone who is already standing.
Examples:
* 请站起来 (qǐng zhàn qǐ lái): Please stand up.
* 站直点 (zhàn zhí diǎn): Stand up straight.
* 现在起立 (xiàn zài qǐ lì): Please stand up now.
* 他站着等公交车 (tā zhàn zhe děng gōng jiāo chē): He is standing waiting for the bus.
The best way to say "stand up" will depend on the specific situation and the desired level of formality.