名词
中文翻译：时间推移曲线
同义词：
['time curve', 'time trend curve', 'time series curve']
例句：
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1. The company's financial performance has been steadily improving over the past few years.
该公司过去几年的财务状况稳步改善。
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2. The growth rate of the economy has been declining in recent years.
近年来，经济增长率一直在下降。
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3. The time-creep curve shows how the population is aging over time.
时间推移曲线显示了人口随时间老龄化的趋势。