英语翻译x指生育期平均温度与30℃的差值,低于30℃取正值,等于或高于30℃则温度差为“0”

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英语翻译
x指生育期平均温度与30℃的差值,低于30℃取正值,等于或高于30℃则温度差为“0”

x is the difference between the average temperature of the child-bearing period and 30 degrees,take positive number if lower than 30 degrees,temperature difference is 0 degree if greater equal than 30 degrees

x refers to the average growth difference between temperature and 30 ℃,
below 30 ℃ to take positive, equal to or higher than 30 ℃ temperature difference is "0"