名词
中文翻译：Unknown
同义词：
['first meridian', 'first latitude', 'first longitude']
例句：
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1. Thefirst lunar meridian is the line that divides the Earth into two hemispheres.
第一月度纬线是把地球分成两个半球的线。
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2. The first lunar meridian is also known as the Greenwich Meridian.
第一月度纬线也被称为格林威治子午线。
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3.During the winter solstice, the sun crosses the first lunar meridian.
在冬至日，太阳穿过第一月度纬线。