Photo Tip: Mentally divide your frame into thirds-down and across. Avoid positioning your subject dead center.

拍照提示：心里面把取景框纵横三分，避免你的主体出现在死气沉沉的中心。

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Rectify the axis lines, levelness and elevation of the positioning form, fix it by electric welding on the bear frame and then weld sufficient supports and lifts.

校正定位模板的轴线、水平度和标高，用电焊固定在支架上，并焊上足够数量的支撑和拉杆。

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Firstly, a series of reference systems, related to GPS navigation positioning system, such as timing system, reference frame and force model system, are discussed in detail.

本文详细地论述了与GPS导航定位系统一系列有关的参考系统：时间系统、坐标系统和力模型系统。

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