Officials from Greenwich Observatory have the clock checked twice a day.

格林威治天文台的职员们每天对大钟检查两次.

《用法词典》

China boasts the world's earliest observatory, built in Nanking in 1385 in the Ming Dynasty ( 1368 A . D . - 1644 A . D . ), three centuries ahead of the Greenwich Observatory built in Britain in 1670.

中国建有世界上最早的气象台. 公元1385年,明朝在南京建立观象台, 比英国格林尼治观象台 ( 建于1670年 ) 早三个世纪.

《现代汉英综合大词典》

Officials from Greenwich OBservatory have the clock checked twice a day.

格林威治天文台的高级职员每天把大钟校对两次.

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