keep back straight的意思|示意

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。

You should keep your back straight.

你应该把后背挺直。

Keep your head upright, shoulders horizontal, chest broad, back straight.

头容正，肩容平，胸容宽，背容直。

Sharp blade key: hand must keep horizontal motion, force must be uniform and owner. on back must be straight or round straight, nearly edge department can not have a little hunchback.

刀刃锋利的关键所在：手必须保持水平运动，力必须均匀，刀背必须保持平直或圆直，近刃口部不得有一点驼背。

Keep your upper back and neck comfortably straight.

保持后背上部和颈部舒适挺直。

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。