non-circular          
adjective (also noncircular) uk/ˌnɒnˈsɜː.kjə.lər/ us/ˌnɑːnˈsɝː.kjə.lɚ/
 非圆形的;非环形的
not shaped like a circle
  This part has a highly irregular and non-circular shape. 这部分具有高度不规则和非圆弧形状。 
 The painting consisted of a single, noncircular blob. 这幅画上只画着一个不圆的点。 
  (论证)直接有效的
A non-circular argument is effective because it does not keep returning to the same points.
  It is impossible to produce a non-circular justification of this principle. 不可能对这一原则做非循环论证。 
 Ideally, the analysis will be non-circular and informative. 理想情况下,分析应该是直接有效且能提供有用信息的。 
 - More examples
 - Most of the objects were non-circular or of irregular shape.
 - The lower disc is larger and non-circular in shape.
 - We have no noncircular reason to think that Aristotle's theory was correct.