一幅古代中国画中展示了使用杠杆推进臼和杵的操作(图6)。
An ancient Chinese drawing shows the use of a lever to facilitate the operation of the mortar and pestle (Figure 6).
在手工绘制两点透视图时，都会碰到图幅过大造成灭点与视点落在图板之外而难以操作的难题。
By employing this, the two point perspective view can be completed with the auxiliary point even in the extremely difficult situation.
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