The hammer core is lifted to a certain height by an oil cylinder or other lifting device then falling freely.
其锤芯由提升油缸或其他提升装置提升到一定高度，然后自由落下。
After effort, up to a certain height, will be layered and hierarchical perspective, then planning, learning ability and efficiency are important.
付出努力后，上升到一定的高度，才会有层次感和层次视野，那么规划，学习能力和效率很重要。
Continue to rise to the height of 3, the first lifting weights, need to try hanging, namely first slow will lift a weight, to rise to a certain height to determine no problem.
第一次进行吊重物时，需要先进行试吊，即先缓慢的将重物吊起，升到一定高度确定没问题以后，在继续提升到所需要的高度。
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