Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.

在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。

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Most Instructional Design models are variations on the more general ADDIE model, which has been in use in various forms since about 1975.

大多数指导性设计模型都是由更为通用的ADDIE模型变化而来的，该模型自1975年以来一直被以各种形式使用着。

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As you work on design, keep your domain-relevant variations at the back of your mind!

当你进行设计工作时，必须随时考虑相关领域的变化。

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Abaci are still widely used in the East, with slight variations in design--such as the number of beads and wires, and the presence of dividing beams--occurring between countries.

FORBES

Mr Black said the parliament's corporate body had not significantly altered requirements over the last four years and as such the main cause of the delay since September 2000 was the production of detailed variations in the design and the late delivery of information.

BBC: NEWS | UK | Scotland | Watchdog hits out over Holyrood

Other documents disclosed variations on the iPad design, including the fact the company considered a kickstand for the device.

WSJ: Apple's Secrets Revealed at Trial