Keep back straight and bend knees.
背要直，只弯两膝。
Never bend your head. Hold it high. Look the world straight in the eye.
千万不要低头，应该把头抬的高高的，眼睛直视世界。
The elbow may be resolved into straight section and a bend.
将回弯头分解为直管段和回弯两部分。
Correlations were conducted respectively according to straight tube, up return bend and down return bend.
依此按直管段，上回湾和下回弯分别作关联。
Correlations were conducted respectively according to straight tube, up return bend and down return bend.
依此按直管段，上回湾和下回弯分别作关联。
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