You'll look taller if you stand up straight.

站直身子，你会显得高些。

《牛津词典》

If you stand up straight, you'll give an impression of self-confidence, even if you're quaking in your boots.

只要你站直了，就会给人一种自信的印象，哪怕你正紧张得发抖。

《柯林斯英汉双解大词典》

If you stand up seven times, sit down eight.

站起来七次，坐下去八次。

youdao

If you stand under a skylight in the Visitor Center, you can see the bronze statue of Freedom high up on the dome outside.

VOA: special.2010.01.27

Actually, if the teaching fellows could stand up so people could at least recognize you, that would be wonderful.

如果助教们能起立让大家都能,认识你们就更好了。

耶鲁公开课 - 旧约导论课程节选

You guys have to decide whether you, okay. So if you're going to, if you're running you stand up.

你们需要考虑是否你们,这么说吧,如果你们要,如果你要参选,你就站起来

耶鲁公开课 - 博弈论课程节选

And if you stand up to evil, you are yourself an extremist.

CENTERFORSECURITYPOLICY: Convenient moral blindness

But if you can stand up, state your case, and in doing so make people believe in the possible then you are worthy of being listened to, and ultimately followed.

FORBES: Three Cheers for Optimism

If you can stand up, introduce yourself when the question has been asked, and we should have some microphones in the audience -- right?

WHITEHOUSE: Town Hall in Arnold, Missouri