Secular trend is the value of the variable tends to increase or decrease over a long period of time.
长期趋势是指变量的值在一个长时期内所呈现的增加或减少的趋势。
The short run is the period of time that is long enough to adjust variable inputs, such as materials and production labor , but too short to allow all inputs to be changed.
短期运行指的是在时间上足够长去调整可变投入，例如原料和生产工人，但是因时间太短而不能改变所有的投入因素。
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