31. This model of typewriter is efficient and endurable , economical and practical for middle school students.

此款打印机高效，耐用，经济特别适合与中学生使用。

32. The computer we produced is characterized by its high quality, compact-sized,

energy-saving and it' also easy-to-learn and easy-to-operate.

我们生产的电脑以高品质，结构紧凑，节能，学习操作简易而著称。

33.They are not only as low-priced as other makers, but they are distinctly superior in the following respects .

我们的产品不仅与同等产品一样价位低廉，而且在以下一些方面更具有先进之处。

34. You will get a 30% increasing production upon using this machine and also it allows one people to perform the task of three people.

使用这台机器可以使生产率提高30%，同样也可以使三个人所做的工作，由一个人就可以完成。

35. This product will pay its own way in a year.

此机器可以维持使用一年。

36.This machine will pay back your investment in 6 month.

使用这台机器6个月就可收回投资成本。

37.The new type of suitcase card designed by our engineers is very ingenious and practical.

我们的工程师设计的包装物卡片精致而实用。

38.This kind of bicycle can be folded in half and handy to carry around ,especially useful during traveling and traffic jams.

这款自行车可以折叠成一半那么大，便于手提，特别适用与旅行或交通拥挤时。

39.The maximum speed of this kind of variable speed bicycle is 30 K/H .

这款赛车速度最快可达30公里每小时。

40.These machines have few breakdowns and easy to maintain because of their simple mechanical structure.

此机构设备结构简单，因此故障少，便于维护。