滚动日志，查看中间对象的实例化情况。
Scroll through the log to see how intermediate objects are instantiated.
锯架进给导向为中间导向加下导向，且为滚动导向，保证了运动的平稳性和灵活性。
The feeding guide of the sawing frame is the middle guide with down guide, it is also rolling guide, which pledged the equability and agility of the movement.
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