This is a useful device for detecting electrical activity.

这是用来探测电流活动的仪器。

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It needs plenty of engineering before it can be a useful device.

在要成为一个实用装置，还需要大量的工程设计。

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This is a useful device for business presentations and astronomic purposes.

这是一个有用的装置业务的介绍和天文用途。

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For China's growing international profile, he has been a useful branding device.

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Sending a message may, in fact, be a very useful device.

NPR: Foreign Relations Panel Hears from Rice on Iran

Maps are a highly useful feature on a mobile device, but Apple is going to fix the issues with its software, and in any case there are plenty of other apps and websites to turn to for directions for those who want another source.

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