求翻译：systems are essential. In thiswork, the focus is on selecting control variables that will ensure that the promised energy savings are achieved. The是什么意思？

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systems are essential. In thiswork, the focus is on selecting control variables that will ensure that the promised energy savings are achieved. The

问题补充：

匿名	2013-05-23 12:21:38 系统是必不可少的。在thiswork，重点是选择控制变量，将确保实现承诺的节约能源。 “

匿名	2013-05-23 12:23:18 thiswork In systems are essential. The focus is on selecting, control variables that will ensure that the promised energy savings are achieved The .

匿名	2013-05-23 12:24:58 systems are essential. In thiswork, the focus is on selecting control variables that will ensure that the promised energy savings are achieved. The

匿名	2013-05-23 12:26:38 systems are essential. In thiswork, the focus is on selecting control variables that will ensure that the promised energy savings are achieved. The

匿名	2013-05-23 12:28:18

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