It's [the result of] a long tradition from the later years of the Qing dynasty down to today. But we restudied the problem and revisited it and made it more perfect.
拼音源自清朝末年至今的长期实践，而我们只不过是对过去的问题重新研究和进行修改，使之更完美。
3
Mehthod The clinicopathological data of 10 children patients with bone metastatic neuroblastoma who were misdiagnosed and mistreated were restudied and their biologic behaviors were observed.