古代天文学家相信天穹是永恒的，在人类时间之前与之后都不曾改变。
Ancient astronomers believed the heavens were sempiternal, existing unchanged before and beyond human time.
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解释
sempiternal 在此指超越时间限制、无始无终的永恒状态。
Ancient astronomers believed the heavens were sempiternal, existing unchanged before and beyond human time.
sempiternal 在此指超越时间限制、无始无终的永恒状态。