How Do You Know What Time It Is?

Robert E. Wells 著, Robert E. Wells 绘

出版社：Albert

出版时间：2002-01

ISBN：9780807579404

词汇量：1401

页数：32

类别：

虚构：非虚构

开本：

阅读年龄：阅读年龄 5-6岁 (33.3%), 4-5岁 (22.2%)

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What would life be like with no clocks and no calendars? How would you know when to get up in the morning? Long, long ago, all people could do was watch the sun and moon and try to figure things out. Eventually, they made simple clocks like sundials.

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