Directional Couplers are four-port networks and fairly difficult to design.

定向耦合器是四端口网络，直接设计十分困难。

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Method and its application of uneven ground modifying in directional drilling locus design are narrated in this article.

叙述了在定向钻进的钻孔轨迹设计时，地面不平整度修正的方法与应用。

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This paper discusses some important problems of the design of blasting in dam construction by directional explosion.

本文就定向爆破筑坝时爆破设计计算的主要问题进行了初步探讨。

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Gamers do not have to worry about excess heat while having all of their settings cranked up, keeping the laptop cool is accomplished by an efficient and quiet design using a larger, single omni-directional blower fan and dual heat pipe and heat sink system, minimizing the noise and increasing the efficiency over other designs that utilize two smaller and louder blowers.

ENGADGET: Maingear announces Nomad 15 gaming laptop: small in size, big on specs

Fling mini's unique spiral design creates actual physical resistance so gamers are assured of greater directional control.

ENGADGET: Ten One Design's Fling mini now delivering tactile control to touchscreen gamers