Describes the principle of use case model technology, discusses the requirement elicitation based on use case modeling, sums up some experience and understanding from practice.

在描述用例建模技术原理的基础上，重点讨论了基于用例建模的需求获取，并对一些经验和体会加以总结。

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For the better part of a century, most biologists have been reluctant to use those words, mindful of a principle of evolution that says "evolution cannot run backwards".

在大半个世纪里，大多数生物学家都不愿使用这些词，因为他们牢记着一条进化论的原则，即“进化不能倒退”。

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Most others use the principle of an underwater windmill whose rotors are turned by the tide.

大多数其他的是利用水下风车的原理，水下风车的转子被潮汐所推动。

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We use the concept of conservation of states and the Aufbau Principle.

我们利用该状态的概念,和构造原理。

麻省理工公开课 - 固态化学导论课程节选

Our bodies have mechanisms like that, that mainly use the principle of negative feedback in order to control the parameters that are important for life within a certain range.

我们的身体有着与之类似的机制,主要依靠负反馈原理来,将与生命息息相关的指标控制在一定范围

耶鲁公开课 - 生物医学工程探索课程节选

The e-learning programme is founded on the basic and practical principle that the use of the internet as a learning tool not only creates anonymity and thus dismantles the psychological barriers that prevent illiterate adults from resuming their studies but also enables them to balance their work, family and learning commitments by learning at home at whatever time is suitable to them.

UNESCO: Ich will lernen (I want to learn)

Widely considered the "Magna Carta of space law, " this treaty lays down the fundamental principle of non-appropriation and that the exploration and use of space shall be the province of all mankind.

CNN: Who owns the moon? It's 'complicated,' say experts

South Africa has recently approved in principle the use of culling to control populations.

BBC: Ivory auction opens amid concerns