风一向多变，因此它永远比不上廉价又脏兮兮的煤，后者产出了美国半数电力。
Wind is inherently variable, so it can never compete with the cheap and dirty coal that generates half of America's electricity.
童年期向青春期的转变阶段是发育的关键时期，生理、认知及社交等方面随之发生许多变化。
The transition into puberty is a critical developmental period, associated with many biological, cognitive and social changes.
在动态多变的市场环境下，供应链需要以最小的成本、最短的时间向顾客传递更多的价值。
In the dynamic and changeful market environment, a supply chain should use the least cost to transfer the most value to the customers in the shortest time.
城市如人，向旅客展示出多变的性格。
Cities were always like people, showing their varying personalities to the traveler.
假设空气弹簧的垂向刚度仅取决于内部气压 ，从工程热力学的气体多变方程出发推导了空气弹簧的垂向刚度。
Set out from the angle of the engineering applying, deduct calculations of air spring vertical stiffness with different guiding accessories.
假设空气弹簧的垂向刚度仅取决于内部气压 ，从工程热力学的气体多变方程出发推导了空气弹簧的垂向刚度。
Set out from the angle of the engineering applying, deduct calculations of air spring vertical stiffness with different guiding accessories.
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