提醒你需要做些什么，告诉你什么事作重要的，并留有记录。
It can remind you of what you need to do, tell you what is most important, and even get you back on track.
照片上留有光的痕迹，唱片里记录了声音。
In a photograph light is recorded; in a recording sound is recorded.
父窗口保留有该项是否包含子项的记录。
The parent window keeps track of whether the item has child items.
父窗口保留有该项是否包含子项的记录。
The parent window keeps track of whether the item has child items.
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