Garbage can is a kind of useful device in landscape.

垃圾箱是园林中最常见的一类实用性小品。

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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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But, a couple of weeks with the gorgeous, if questionably useful device, has started to produce some truly exciting results.

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

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Even with such a small number of electrodes that allowed for a small patch of vision, patients unexpectedly said they found the device useful by moving their heads back and forth and scanning the environment, said Dr. Greenberg.

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