The bipeds stood up straight.

二足动物开始直立行走。

youdao

She stood up straight and still!

而她却笔直站了起来！

youdao

The supervisor stood up straight and stiff and told his story like a lesson;

行政长官笔直僵硬地站着，好像上课似地讲着他经历的事情经过。

youdao

Then he stood up straight and responded loudly enough for all the kids to hear.

NPR: Del Close and the Roots of Second City

Bachmann stood up straight and punched the air.

NEWYORKER: Leap of Faith

He stood up and with a straight face said it wouldn't be appropriate for him to give stock tips.

CNN: ASIANOW - TIME Asia