如用燃料烧热的引擎把化学能转为热能，电池把化学能转为电能。

For example, fuel-Burning heat engines convert chemical energy to thermal energy; Batteries convert chemical energy to electrical energy .

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为了提高化学主题搜索引擎的查询效果，采用距离加权七一近邻分类算法来进行自动分类。

In order to improve the performance of chemistry-focused search engines, an automatic text categorization algorithm is proposed based on the distance-weighted k-nearest neighbor algorithm.

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在网络教育中，传统的导航方式或搜索引擎方式引导学习过程有着自身固有的缺陷，无法实现智能化、个性化学习。

In network - based education, a traditional navigator or a searching engine had some inherent weaknesses, so individualized intelligent learning has been difficult to realize.

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