The more points you place, the greater the degree of control you will have over the general direction and curvature of your river.

你放置的点越多，那么你在河流整体方向，曲率的控制度也会更高。

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Objective: To analyse the root canal curvature frequency, position, direction and degree of the maxillary first molars.

目的：分析上颌第一磨牙根管弯曲位置、方向及弯曲度。

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X-ray examination revealed that there were 69 cases whose cervical vertebral physiological curvature became straight or reverse, or with certain degree of degenerative change.

其中有69例患者经过X射线检查显示颈椎生理曲度变直或反向，或有不同程度的退行性改变。

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