Three types of traction power are further compared both economically and technically.

并进一步对三种牵引动力作了技术经济比较。

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The model will make the traction power system to be more safe, reliable and economical.

该模型将使牵引供电系统的建立更加安全、可靠、经济。

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On the other hand, since traction power supply network is a AC-DC network, its running modes are complicated.

另一方面，地铁牵引供电网络是一个交直流混合的网络，运行方式较为复杂。

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At first, Drobo got traction with power users, such as video editors.

FORBES: Drobo: Making Storage Sexy and Very Profitable

Translation: It finds the wheel or wheel with the most traction and applies power there.

FORBES: How To Drive A Porsche In The Snow

Their voices can be heard far and wide some may even make it onto the NY Index but it is unusual for their views to gain traction amid the entrenched power structure of New York's educational world.

WSJ: In Education, Many Levels, Types of Power