名词
中文翻译：小时圈
同义词：
['hourglass', 'hourglass circle']
例句：
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1.The hour circle is a symbol of the sun's movement across the sky.
小时圈是太阳在天空中移动的象征。
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2.The hour circle helps us to measure time more accurately.
小时圈帮助我们更准确地测量时间。
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3. The hour circle is often used in ancient civilizations to mark the beginning and end of theday.
小时圈在古代文明中常用于标记一天的开始和结束。