Two million years ago, a cave-studded aquifer lay beneath an undulating plain of shallow, wooded valleys and rolling hills.
200万年前，在树木丛生的谷地和波状丘陵地带的起伏平原之下，是洞穴密布的地下蓄水层。
It may make quantitive account of skew ratio from plain roller rolling square bar.
此模型可对平辊轧制矩形件产生的脱方量进行定量计算。
The results show that nitrogen has remarkable influences on rolling contact fatigue life and plain strain fracture toughness, and little influences on wear resistance.
结果表明，含氮量对滚动接触疲劳寿命及平面应变断裂韧性具有很显著的影响，而对耐磨性影响很小。
All over the world, INA develops and produces rolling bearings, plain bearings and linear guides for machine building and engine components for the automotive industry.
INA在全世界范围开发并生产滚动轴承、滑动轴承、直线运动产品和汽车发动机部件。
For flat products like plate and strip, plain rolls are used, and grooved rolls are used for the rolling of sections of various shapes.
根据轧制轧材的温度，轧制可分为热轧和冷轧；因而轧制产品也可分为热轧产品和冷轧产品。
For flat products like plate and strip, plain rolls are used, and grooved rolls are used for the rolling of sections of various shapes.
根据轧制轧材的温度，轧制可分为热轧和冷轧；因而轧制产品也可分为热轧产品和冷轧产品。
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