名词
中文翻译：子午线
同义词：
['central meridian', 'median line']
例句：
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1.The sun is at its highest point on the meridian of longitude 30°N.
太阳在赤道以北30°经线上达到最高点。
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2.The meridian divides the earth into two hemispheres.
子午线将地球分为两个半球。
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3. The meridian is used to measure distances between cities and countries.
子午线用于测量城市和国家之间的距离。