These clocks are sometimes set by the number of hours of light or darkness in a day, by the rhythm of the tides or by the seasons.
这些时钟有时根据一天中白昼或黑夜的小时数目设定，有时根据潮汐的规律或者季节设定。
These clocks are sometimes set by the number of hours of light or darkness in a day, by the rhythm of the tides or by the seasons.
这些时钟有时根据一天中白昼或黑夜的小时数目设定，有时根据潮汐的规律或者季节设定。
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