坐直的短语英文怎么说

"Sit up straight" 是一个常用的短语，意思是坐直。这个短语可能源自于人们对坐姿健康的重视，因为坐直能够防止腰部、背部等肌肉的疲劳和酸痛。

下面是一些例句：

"Sit up straight, please. It's better for your posture." (请坐直，这对你的姿势有好处。)
"My mom always told me to sit up straight at the dinner table." (我妈妈总是告诉我在餐桌前坐直。)
"I try to sit up straight at my desk, but it's hard to maintain good posture for long periods of time." (我尽量在办公桌前坐直，但很难长时间保持良好的姿势。)