N-COUNT A sundial is a device used for telling the time when the sun is shining. The shadow of an upright rod falls onto a flat surface that is marked with the hours, and points to the correct hour. 日晷
Sundials don't work at night or on a cloudy day!
日晷在晚上或阴天不起作用！
Over time, the Chinese first used sundials instead of shadow sticks.
随着时间的推移，中国人第一次使用日晷代替影子表杆。
In order to track temporal hours during the day, inventors created sundials, which indicate time by the length or direction of the sun's shadow.
为了在白天追踪时间，发明家发明了日晷，它通过太阳阴影的长度或方向来指示时间。
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