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关注：1
2013-05-23 12:21
求翻译：Nowadays we can calculate time very accurately,but before the invention of clocks,it was very difficult.One day people taught the time was by using sundials(日晷），but it was impossible to tell the time on cloudy days or at night.是什么意思？ 待解决
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- 离问题结束还有
Nowadays we can calculate time very accurately,but before the invention of clocks,it was very difficult.One day people taught the time was by using sundials(日晷），but it was impossible to tell the time on cloudy days or at night.
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