1.  circinate
2.  annular
3.  toroidal
4.  circular

• 1. 环形的: annular | ring-shaped | doughnut-shaped
• 2. 碳环形的: carbocyclic
• 3. 半环形的: semicircular | semiorbicular

更多释义

• 1.成团的年轻蓝星围绕一个环形的轨迹旋转。
  Clusters of young, blue stars trace a ring around a center that is rotating with the galaxy.
  dict.yoduao.com
• 2.负电荷在运动，它们处在一个环形的轨道中。
  You've got negative charge in motion, and it's in a circular orbit.
  dict.yoduao.com
• 3.用例事务是一个“环形的路线”。
  A use case transaction is a "round trip".
  dict.yoduao.com

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