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。

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.

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声音可以起作用，阴影也能显示出白天的某个时段，根据日期戳对照天气预报可以知道一个视频或照片是否真的拍摄于某个特定的日期。

Shadows can indicate the time of day. Comparing weather reports with date stamps can reveal whether a video or photograph really was taken on a particular date.

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关于白天的情景，我需要全部控制住所有树木投射到建筑上的阴影。

For the daylight scenario I needed to have full control over the shadows of all the trees falling on the building.

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