名词
中文翻译：月相
同义词：
['lunar phase', 'lunar phase indicator']
例句：
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1.The astronomer used a semilunar sign to determine the time of the moon's full moon.
这位天文学家用一个半月相来确定月亮的满月时间。
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2. The scientists were studying the lunar cycle and the semilunar signs that affect it.
科学家们正在研究月球周期以及影响它的半月相。
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3.The ancient civilizations used the semilunar signs to predict the weather and agricultural cycles.
古代文明利用半月相来预测天气和农业周期。