Developing clean energy should be placed at the core of the new environmental protection policy.

发展清洁能源应为新环保政策的核心。

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The core code is clean and easy to extend, and the user interface is very easy to use.

核心代码很干净而且容易扩展，用户界面也非常容易使用。

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Clean separation of front ends, like JAX-WS, from the core code.

从核心代码干净地分离前端，如JAX - WS。

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Asked how its new clean-tech initiative fits into Google's core search and advertising business, Brin said it's part of the company's 70-20-10 rule.

FORBES: Google Goes Green