Neuroscientists have theorized for decades that the human brain time stamps events as they happen, just as a camera tags the date and time onto a digital photo file.
神经系统学家经过几十年的推理论证发现，事情发生时，人类大脑会为其打下时戳，这就像相机为数码相片文件标上日期和时间一样。
Intrinsic tags use existing data (for example, date and time) and add meaning to the attribute.
固有标签使用现有数据(例如，日期及时间)并向属性添加含意。
These tags, called EXIF metadata, specify things like the exposure and f-stop settings, gps information if your camera has it, and, of course, the time and date the photo was taken.
这些标记称为EXIF元数据，是为了说明照片的曝光度和光圈设定，有的相机还会显示GPS信息，当然，还有拍照的时间和日期。
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