circular
adjective uk/ˈsɜː.kjə.lər/ us/ˈsɝː.kjə.lɚ/
B2 圆形的，环形的
shaped like a circle
a circular flowerbed/tablecloth 圆形花坛／桌布
C2 循环论证的;迂回而无效的
A circular argument is one that keeps returning to the same points and is not effective.
circular
noun [ C ] uk/ˈsɜː.kjə.lər/ us/ˈsɝː.kjə.lɚ/
（同时发给很多人的）通知，通报，传单
a letter or notice sent to a large number of people
Circulars and other junk mail go straight in the bin. 传单和其他的垃圾邮件直接扔进垃圾桶。