电影可以记录时间真实、客观的流动。
美国一直是一个流动性很强的国家，但美国人口普查局的最新数据显示，美国的人口流动率已降至有记录以来的最低水平。
The US has always been a remarkably mobile country, but new data from the Census Bureau indicate that mobility has reached its lowest level in recorded history.
这个时钟记录了河流动态的短期不规律和长期趋势。
The clock registers both short-term irregularities and long-term trends in river dynamics.
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