(Theauthor.ProfessorLiuDunisthecurrentDirectoroftheInstitutefortheHistoryofScience,theChineseAcademyofSciences.andeditorofthejournalStudiesintheHistoryofNaturalSciences.ThisEditorialwasoriginallypublishedinChineseinthisjournal,Vol.18,No.3,pp.193~195...