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。

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The test and application of a new efficient and durable synthetic diamond tip on disc saw are described.

叙述了一种新型高效、耐用人造金刚石圆盘锯牛刀头为试验应用情况。

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There are already some good stoves out there, but we can make them much more durable , efficient, and affordable, and scale up production to reach a mass market.

市场上已经有一些效果不错的炉具，但我们可以把它们设计得更耐用、高效，经济实惠，并能扩大生产，投放大众市场。

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In 2008, PDT worked with Perkins Products to develop a lighter, more efficient and durable Next Generation Perkins Brailler that is now actively used in classrooms and homes around the world.

ENGADGET: Perkins Smart Brailler helps the blind learn to type, closes the digital divide

These new materials enable designers to create products that are stronger, lighter, more energy efficient, and more durable than anything that exists today.

FORBES: Why I Believe That This Will Be The Most Innovative Decade In History

Alas, the focus wasn't so much on beauty as on making a machine that shouts, "I am the most powerful, durable and efficient air conditioner in world history!"

WSJ: Ugliness for All