After extraction, the fuel must be used within a few months but can be put almost directly to work in a diesel engine.

经过提炼后的燃料虽必须在数月内使用，却可以直接用于柴油机。

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Cluuz; Web search engine featuring semantic cluster graphs, image extraction, and tag clouds.

Cluuz；网络搜索引擎，功能包括语义丛图表、图像抽取和标签云。

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In this paper, based on the concept extraction algorithm, we propose a concept-based meta search engine infrastructure.

文章在概念抽取算法基础上，提出一种基于概念的元搜索引擎体系结构。

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