The effect of original defect size on the fatigue life can be described with the fourth root of the defect area perpendicular to the loading direction.

试件初始缺陷尺寸对疲劳寿命的影响，可用垂直于载荷方向缺陷截面积的四次方根来表达。

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The fourth predicate $i/*/price = 29 looks for price elements under any root element, not just "book."

第四个谓词 $i/*/price = 29 将查找任何根元素下的 price 元素，而不仅仅是在 “book” 元素下的。

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Fourth, the activity of ascorbic acid oxidase in leaf and root were enhanced. The peroxidase activity in leaf was enhanced too.

第四，叶片与根中的抗坏血酸氧化酶及叶中的过氧化物酶活性显著增强；

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What liberals sometimes forget is that the conservative media took root because many Americans felt the fourth estate was too left-wing.

CNN: Obama, Gore, stop whining about right-wing media