求英语翻译！

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楼主 = =2010/9/10 0:28:00

Many companies use packaging which has been recycled, that is made using old materials.

重点是后面的一句：that is made using old materials.这里是被动语态吧，那后面的using怎么解释。

请能人帮我翻一下，THX~

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2 = =2010/9/10 0:35:00

已解决。
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3 = =2010/9/10 0:54:00

欢迎来到XQ知道
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4 = =2010/9/10 1:05:00

同想问
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