站直了，把肩膀往后放！

___Stand ___up ___straight and put your shoulders back!

她试图坐直，但很快意识到由于缺乏活动，她所有的肌肉都僵硬了。

She tried to ___sit ___up ___straight and quickly realised all her muscles were stiff from non activity.

面试期间，她记得坐直以留下好印象。

During the interview, she remembered to ___sit ___up ___straight to make a good impression.