施肥频率对根密度的影响主要是引起各土层根密度大小的变化，运行方式则对各土层根长占整个剖面根长总和的比例产生影响。

Root length density varied with fertigation frequencies, and the ratio of root length for different soil layers to the total root length in the profile varied with fertigation strategies.

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至少有一位家长拥有四年制学位的学生占6%。

6 percent of the students with at least one parent with a four-year degree.

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对许多产品，劳动力占总成本很小并逐渐减少，而又长有复杂的供应链原来比许多公司意识到的更具风险。

For many products, Labour is a small and diminishing fraction of total costs. And long, complex supply chains turn out to be riskier than many firms realised.

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