What makes oil special is that it is a uniquely dense and portable form of energy.

石油是一种密度大，便于携带的能源。

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GPS devices are designed for mobility, and small, portable form factors are critical to enhancing the portability of each device.

GPS装置是专门为机动、小、便携式形式因素至关重要的可移植性，提高每一个装置。

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The flexible form of the display makes it much more portable than any current mobile computer—it will shape with your pocket.

显示器柔韧的构成形式使它比当代的任何笔记型电脑更轻便——它将与你的口袋的形状相同。

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Thinner than previous generation netbooks, the AO751h still comes with all the same easy-to-use features, sophisticated design and incredibly portable form factor that have made Acer netbooks so wildly popular.

ENGADGET: Acer's Aspire One D250, 751h now on sale in North America

Designed to be the ultimate line for mobile enthusiasts, the new ultraportable line comes in a very portable form factor that weighs only 3.55 pounds so it's easy to take on the go in a book bag or backpack.

ENGADGET: Gateway pumps out EC Series ultraportables

Illuminated manuscripts provided the ideal portable art form for a peripatetic court that moved regularly from its base in Dijon up through the Low Countries it had absorbed by marriage and conquest in the late 14th century.

ECONOMIST: Flemish manuscript painting