有声书是四种产品中最昂贵的，而充气椅是最便宜的。
Sound book is the most expensive of the four products while the inflatable chair is the cheapest.
使用销量最靠前的四种产品时，八个小时里没有出现被蚊虫叮咬的情况。
For the four products that topped ranking, there were no bites after eight hours.
指出以一套装置为基础，根据需要适当调整，以生产上述四种产品中的任一种，在理论上和实践上均是可行的。
It is concluded that the switch production of 4 sulphite products as required in one plant, when slightly altered, is feasible both theoretically and practically.
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