名词
中文翻译：年度平均数
同义词：
['average annual', 'average annual value']
例句：
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1.The annual mean temperature in the region is 15 degrees Celsius.
该地区的年均温度为15摄氏度。
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2.The company's annual mean revenue has increased by 20% over the past year.
该公司的年均收入在过去一年内增长了20%。
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3. The annual mean lifespan of the species is 20 years.
该物种的平均寿命为20年。