You should keep your back straight.
你应该把后背挺直。
Bent your knees, but keep your back straight.
屈膝，保持背部挺直。
Keep your back straight. Thighs tight and shoes right.
保持你的腰背挺直，大腿绷紧和鞋子穿对。
Keep your back straight, head up and turned towards the target, and straighten your bow arm, but keep the elbow unlocked.
保持背部的挺直，头转向目标，伸直你的持弓臂，同事保持肘部的放松。
Pitchford points out several form faults: "You want to keep your back straight and not allow the knee to drift forward ahead of the stance leg.
Pitchford指出许多种错误动作： “你应该保持背部挺直，膝盖不应该向前超过支撑腿。
Keep your upper back and neck comfortably straight.
保持后背上部和颈部舒适挺直。
Keep your front shin vertical, back knee straight, back heel lifted, and chest lifted.
保持前面小腿垂直地板，后膝伸直，后脚跟离地，胸腔上展。
Your body should be straight up in the water; don't lean forward much or hunch over. Keep your shoulders back and look straight ahead.
你的身体在水中应该保持正直，挺胸、目视前方，不要过度前倾或伛偻。
So you want to take your shampoo, hold your arm straight up, keep your arm right next to your ear, and then simply bend your elbow to ninety degree, and then lift it back up.
你要拿起洗发水，手臂向上伸直，紧贴耳朵，然后只要将手肘向后弯曲90度，再将手肘伸直。
Remember, while your thighs are drawing strongly back, resist forward with your upper calves and upper front shins to keep your legs straight.
记住，但你的大腿强有力地往回拉时，保持小腿上部和前侧胫骨的上部向前来保持你腿的正直。
Keep your posture straight and erect. Your head should be up, your back straight, and shoulders level.
保持您的姿势挺而直，抬起头，挺直腰，双肩水平。
Keep your head upright, shoulders horizontal, chest broad, back straight.
头容正，肩容平，胸容宽，背容直。
Set your feet shoulder-width apart, and keep your knees slightly bent, back straight, and eyes focused straight ahead.
双脚与肩同宽，保持膝部稍弯，后背挺直，双眼注视前方。
The most effective way to walk is the natural way. Keep your head high and your back straight .
自然地行走是最有效的步行，要保持抬头挺胸的姿式。
The most effective way to walk is the natural way. Keep your head high and your back straight .
自然地行走是最有效的步行，要保持抬头挺胸的姿式。
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