lǔzhīxuē( xiǎodāo), sòngzhījīn( fǔtóu), zhìliàngdōuhěnhǎo; rúyìdìshēngchǎn, zàilǔzàojīn 'érzàiyànzhìxuē, zhìliàngbùhuìyōuliáng Lu of the cut (knife), Song of the burden (ax), quality is very good; such as ex situ production and in making jin Lu Yan system in the cut, the quality is not good