产品线延伸(line stretching):提高产品组合的广度或加长产品线长度，含向上延伸(upward stretch) 、向下延伸(d略wnward stretch) 、双向延伸(tw略-way stretch) 2.
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Face upward Stretch 仰卧伸展功
As if the long-standing pressure on the spring time when it broke out, the upward stretch is very alarming!
就好象压久的弹簧当其爆发的时候，其向上的弹力是非常惊人的！
Stretch out a hand horizontally with the palm of the hand downward and the forefinger of the other hand upward to the first hand's palm and do rotated action.
一手平举，手心向下，另一手食指向上，对着第一只手的手心，做旋转动作。
Keeping the left elbow straight, slowly bend the left wrist upward until you feel a stretch.
保持左手臂伸直，慢慢地把左手腕朝上弯曲直到感到拉力。
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