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1. The relationship between the two variablesis well-defined in this period-luminosity relation.
这两个变量之间的关系在这段周期-亮度关系中被很好地定义了。
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2. The study of this relationship hasled to significant advancements in our understandingof the universe.
研究这种关系已经使我们对宇宙的理解取得了重大进步。
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3. In this period-luminosity relation, wecan observe how the intensity of light changesover time.
在这个周期-亮度关系中，我们可以观察到光的强度随时间的变化。