31. This model of typewriter is efficient and durable, economical and practical for middle school students.
这个型号的打字机对中学生来说，高效、耐用、经济、实惠。
32. The computer we produced is characterized by its high quality, compact size, energy saving and is also easy to learn and easy to operate.
我们生产的计算机其特点是质量好，体积小，节能，而且易学好用。
33. They are not only as low-priced as the goods of other markers, but they are distinctly superior in the following respects.
它们不但和其它厂家的产品一样低廉，而且在以下几个方面有其独特的优越性。
34. You will get a 30% increase in production upon using this machine and also it allows one person to perform the tasks of three people.
一旦使用该机器，你们将会增产30%，而且一个人可以顶3个人使用。
35. This product will pay its own way in a year.
该产品一年就可收回成本。
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