ring [rɪŋ]

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n.环，戒指，铃声，圈；vt.包围，挂铃铛；vi.鸣响，回响，在空气中螺旋上扬，形成圈

a circle of any material , or any group of things or people in a circular shape or arrangement

They keep on work until the bell ring. 他们一直工作到铃响。
They are standing in a ring. 他们站成了一个圈。