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the material forms a torus,a doughnut shaoed cloud of ions t

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the material forms a torus,a doughnut shaoed cloud of ions that glow in the ultraviolet.5094 什么
the material forms a torus,a doughnut shaoed cloud of ions that glow in the ultraviolet.5094
the material forms a torus,a doughnut shaoed cloud of ions t
这些物质形成了环状,是一种在紫外线范围发光的环状离子云.(a doughnut shaped)