And you'll probably only practice it a few times-for a lifetime cumulative duration of as little as 30 minutes.
而你可能只会练习几次，一辈子累计持续时间仅为30分钟。
The cumulative quantity of runoff's nutrient increases correspondingly along with the more enhancing rainfall intensity and longer duration of runoff generation.
随着雨强的增大、产流时间的增加，径流养分累积量也相应增大。
The probability density function, cumulative distribution function, average level crossing rate and average fade duration of each composite fading channel are analyzed, and some uniform expression.
给出了各种复合衰落的概率密度函数、累积分布函数、平均电平交叉率、平均衰落时间的统一表达式。
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