The angle actually goes from minus pi over two to pi over two.
实际上，角度取值范围是从-π/2到π
Main outcome measures were disc compression, defined as post - minus preloading disc height, and lumbar asymmetry, defined as the coronal Cobb Angle between the superior endplates of S1 and L1.
用椎间盘后减载预负荷高度、腰椎不对称度和L1、S1上终板之间冠状面cobb角来定义主要的测量结果，即椎间盘压缩程度。
There is a special way of design of carbon alloy slotting tool which has minus rake angle to increase the ability of resisting the tooth edge collapse.
为提高硬质合金插齿刀的抗崩刃能力，需要采用负前角的特殊设计；
There is a special way of design of carbon alloy slotting tool which has minus rake angle to increase the ability of resisting the tooth edge collapse.
为提高硬质合金插齿刀的抗崩刃能力，需要采用负前角的特殊设计；
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