但是，这需要能源-而当这些“垃圾”可以以现有形式变成有用的东西时为什么要多花能源呢？
But that takes energy - and why spend that energy when this "rubbish" can be turned into something useful in its present form?
随着时间的推移，你可能已经下载了各种各样的东西——一些是有用的，而另一些只是一般的垃圾。
Over time, you have probably downloaded all sorts of things — some useful, and others that are just plain trash.
每天，孩子俩都会到垃圾场来找点有用的东西拿去卖钱来买吃的。
Every day they searched the junkyard for something useful that they can resell for money so they can buy food.
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