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本初子午线 /běnchū zǐwǔxiàn/ meaning in English

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本初子午线 /běnchū zǐwǔxiàn/ noun

prime meridian(reference line)
noun
[UK: praɪm mə.ˈrɪ.dɪən] [US: ˈpraɪm mə.ˈrɪ.diən]

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