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长期趋势 chángqī qūshì
math.	sekularni trend
stat.	trend
长期趋势 通过一段很长时间的观测值来预期流行倾向或总体方向，往往通过研究和分析统计数据而确定。 chángqī qūshì
environ.	dolgoročna težnja/usmeritev; dolgoročni trend