求翻译：The amount of material removed is controlled by the speed of the screw and the cross-section of the opening of the upper是什么意思？

待解决

悬赏分：1 - 离问题结束还有

The amount of material removed is controlled by the speed of the screw and the cross-section of the opening of the upper

问题补充：

匿名	2013-05-23 12:21:38 金额

匿名	2013-05-23 12:23:18 该数额的

匿名	2013-05-23 12:24:58 数额

匿名	2013-05-23 12:26:38 金额

匿名	2013-05-23 12:28:18 数量

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