compactor

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In theory, the compactor slides all the live objects together to one end of the heap, leaving a single contiguous block of free space.
理论上，压缩程序会将所有活动对象都移动到堆的一端，留下一块连续的闲置空间。
The compactor then produces a “sandwich” which is easier to handle and transport, says Jeff Ashby of Rocky Mountain Recycling, who invented the process for Wal-Mart.
这样垃圾捣碎机便做出了一个“三明治”，处理与运输起来就容易多了，石山回收公司的杰夫•阿斯柏（Jeff Ashby）讲道，就是此人为沃尔马公司创造了这种工艺。
It involves putting a layer of cardboard at the bottom of a rubbish compactor before filling it with waste material, and then putting another layer of cardboard on top.
这也就需要在垃圾捣碎机被填满之前在其底部放置一层纸板，然后在其顶部也放置一层纸板。

When she gets to the compactor, she stands on her toes and strains to stuff the trash bags into the overhead opening.
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The information harvested from each compactor allows waste managers to optimize collection routes and schedules and prevent hot spots from becoming problems.
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a machine that crushes material, especially waste material, so that it fits into a smaller space