因为日历上变化的月份长度，所以对于时间间隔有两个不同的标准测量单位。
There are two different standard units of measure for intervals because of the varying month lengths in calendars.
这个测量单位以年和月的数量报告两个事件之间的时间间隔。
This unit of measure reports intervals as the number of years and months between two events.
这个测量单位以天、小时、分钟、秒和毫秒报告两个事件之间的时间间隔。
This unit of measure reports intervals as the number of days, hours, minutes, seconds, and fractional seconds between two events.
随着星系对离我们越来越远，它们之间的相互距离却在缩小，就像一个尺子在远方看，单位间隔会变小一样。
The separation appears to get smaller as the galaxies move farther away, just like a ruler of fixed length (right-hand illustration).
随着星系对离我们越来越远，它们之间的相互距离却在缩小，就像一个尺子在远方看，单位间隔会变小一样。
The separation appears to get smaller as the galaxies move farther away, just like a ruler of fixed length (right-hand illustration).
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