以下为句子列表：
英文: Some of the nebulae exhibit a set of concentric rings like bull's-eyes, possibly indicating that the ejection process was episodic rather than continuous.
中文: 有些星云显露出一组圆形标靶般的同心环结构，可能暗示喷发气壳的过程并不连贯。
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英文: We have in the photos concentric rings just as Plato described.
中文: 我们照片里的同心环，正与柏拉图描述的一样。」
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