毕竟煤炭矿床本身就是石化的泥炭沼泽，而泥炭的成份是腐烂的植物。当粘土泥浆逐渐硬化成页岩石，腐烂的植物则在上面留下了它们的印记。
Coal deposits, after all, are petrified peat swamps, and peat is made from decaying plants, which leave their imprints in mud and clay as it hardens into shale stone.
大约从45岁左右初步，晶状体逐渐硬化、弹性下降，睫状体的功用也在减弱，然后出现老花眼。
From about the age of 45 or so initially, the lens gradually hardening, decreased flexibility, ciliary body function has been weakened, and onset of presbyopia.
随着我们变老，血管逐渐硬化，这被认为增加高血压的风险。
As we age, our blood vessels get stiffer, and that's thought to increase the risk of high blood pressure.
研究了渐硬恢复力刚性滑移结构在水平和竖向高斯白噪声地面作用下稳态响应的概率分布问题。
The probability distribution problem of the steady-state responses to horizontal and vertical Gaussian white noises of rigid sliding structures with hardening restoring force is studied in this paper.
由试验资料发现，剪切面上的剪切应力与剪切位移关系可分为逐渐硬化和峰值后软化两种类型。
It is found that the relationship between cutting stress and displacement can be divided into two types of gradually hardening and softening alter peak value.
利用等效线性化方法推导了具有渐硬非线性复位弹簧的滑动系统的高斯白噪声激励稳态随机响应概率分布的解析解。
The analytic solutions of the probability density of the steady state responses of Coulomb sliding systems with gradually strong springs to Gaussian white noise are derived.
将土的剪切试验测得的应力-应变关系分成逐渐硬化类型和峰值后软化类型，提出了可以统一表示这两种类型应力-应变关系的表达式。
The stress - strain relationship of soil estabished from shear tests is distinguished into two kinds-progressive hardening type and post-peak softening type.
通过对变撑臂渐硬性钢板弹簧的全面研究，推导出理论计算公式；通过试验测试，得到了试验结果。
Theoretical formulas were established by overall analysis to the progressive rate springs with variable arm length, and their results were obtained by experiment test.
通过对变撑臂渐硬性钢板弹簧的全面研究，推导出理论计算公式；通过试验测试，得到了试验结果。
Theoretical formulas were established by overall analysis to the progressive rate springs with variable arm length, and their results were obtained by experiment test.
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