每一种新产品都会有一个相对较长的使用周期。
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。
The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life span.
能够能进行多种体裁和题材的写作，并能灵活使用较长和复杂的语言对可期和不可期的情况作出反应。
To write in many styles based on many topics and respond to expected and unexpected situations with the help of using flexible and relatively long linguistic texts.
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