这种迹象表明，变异不仅是非随机的、范围有限的，而且根本就是很难获得的。
The evidence suggests that not only is it nonrandom and parochial, but it is difficult to come by at all.
笔者探讨了这一方法，考虑土性分布参数和荷载变异性，用二阶摄动随机有限元法进行了浅地基沉降的概率分析。
This study calculated the statistical moments of settlement for shallow foundation by using second-order perturbation stochastic finite element method.
但是由于病原菌变异迅速，植物抗性资源有限，常规育种方法费时费力，现有抗性资源已经远远不能满足生产的需要。
At present, one important common solution to this problem is to apply resistant resource to develop new disease-resistant varieties by common breeding method.
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