doughnut ring

• 圈饼状环

doughnut ring的用法和样例：

例句

1. For some time, scientists have suspected the presence of tiny moonlets that orbit Saturn in association with the clumpy and braided-looking ring.
   一段时间以来，科学家们推测围绕土星运行的微小卫星与结块和麻花状环有关。