For example, an age is a value that changes over time and can be calculated from a specific date — the birth or creation date.
例如,年龄是一个随时间而不断改变的值,可以通过一个特定的日期加以计算,即出生日期或创建日期。
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Photographs and letters are also helpful; knowing specific dates like the birth of a sibling or a move to a different house can help place fragmentary memories in time.