Making this estimate is a relatively simple task, not so simple is estimating how many of these worlds might play host to life.
估算有多少外行星是简单的工作，但是要估算这些外行星上中有多少可能有生命的存在就没有那么简单了。
This paper proposes a new estimating method which, for the first time. introduces reliability analysis into the life estimation of railway rails.
本文提出了一种新的钢轨疲劳寿命的可靠度估算方法，使可靠性分析第一次进入钢轨的寿命估算。
A computational model was presented in estimating residual life of reformer tubes by the method of model.
在应用模型法估计转化管剩余寿命中，本文提出了一个力学计算模型。
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