由于磷矿的开采和磷在自然界中近乎单向循环，磷资源日益枯竭。
Owing to the exploitation of phosphorite and phosphorus's unilateral cycle in nature, phosphorus resource is increasingly exhausted.
方法采用自行研制的细胞单向循环等应变加载装置对成骨细胞加载。
Methods a self designed uniaxial, homogeneous and cyclic tension strain device was used to load the osteoblasts of Wistar rats.
特别针对砂性土壤，提出了应用室内三轴循环试验的结果评估单桩在单向循环侧向力下的变形方法。
The usually used design method, p-y curves method, is unsuitable for estimating the deformation response of the large-diameter monopile under long-term cyclic lateral load.
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