The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life span.
我们能源系统的主要组成部分,如燃料生产、提炼、发电和分配,用的是昂贵的、使用寿命较长的装置。
Water, malt, hop and yeast are the main components of the beer production process.
水、麦芽、啤酒花和酵母是啤酒酿制过程中的主要成分。
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