The same catalogue included a type of two-pole concentric plug and socket.

相同的目录包括一种两极同心插头和插座。

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Using a simple analogy, you can think of an extension as a plug and an extension point as a socket.

使用一个简单的类比，您可以把扩展视为插头并把扩展点视为插座。

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And, yes, they could even plug themselves into a power socket to recharge their own batteries.

而且，它们居然能够将自己放入电源插座内，进行充电。

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To find the energy hogs, you simply plug each appliance into the meter in turn, and then plug the meter into the wall socket and leave it switched on for a fixed time.

ECONOMIST: The much-talked-of smart grid prepares to enter the home

The pen has been designed to be compact and easy to use, you just plug it into a power socket and can start drawing anything within minutes.

FORBES: Get Ready to Doodle With The First 3D Drawing Pen

The court heard there were baby gates in place and plug socket covers along with coverings on table edges.

BBC: Shaun Binfield and Sally Dent