背挺直，跪坐于两个脚后跟上。
在做这个动作时，双脚与肩同宽，背挺直，保持重心稳定。
To do a squat to biceps curl, you start with your feet about shoulder-width apart, spine straight and your core stable.
很多人(包括我自己)也许都会一直把背挺直的站着坐着。
Many people (including me until recently) might sit or stand with a straight back in a good posture.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
It is crucial that the upper back and neck are held in an erect position to give support for the head.
主人挺直了他的背。
她很快挺直背，整理好自己的衣服，然后，站起身来。
She quickly straightened up her back, collected herself together and got up.
当作者或站着的时候，背要挺直，但是不要紧张和拘谨。
While sitting or standing, the back should be straight, but not tense or tight.
当你要搬运重物时，你应该在它附近蹲下来，并挺直你的背，抬起你的头。
When you lift, squat close to the object with your back straight and head up.
我进入第二个男孩子的家时，他正趴在家里的矮桌上写作业，我教他挺直了背，抬起头，标准了写作业的姿势，为了他的身体健康。
We taught the second boy, who was writing his homework on a dwarf table when we entered, to stand with his back straight, head held up.
她走出来的时候，稍稍挺直了背，因为她知道要上场了。
And, as she walked along, she 12 straightened herself a little bit, because she knew she was on.
她走出来的时候，稍稍挺直了背，因为她知道要上场了。
And, as she walked along, she 12 straightened herself a little bit, because she knew she was on.
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