1. took the in bus; the in basket. 
   坐内环公共汽车；篮口朝里的篮子。
2. To form concentric rings or spirals. 
   绕成盘状形成同心环或螺旋线
3. The plane circled the airport before landing. 
   飞机在着陆前绕机场环飞。
4. To wind in concentric rings or spirals. 
   盘绕绕成同心环或螺旋线
5. marine polyps that resemble flowers but have oral rings of tentacles; differ from corals in forming no hard skeleton. 
   海生珊瑚虫，象花但触须上有口环；与珊瑚的区别是它没有硬的骨骼。

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