求翻译：The nature of the learning environment and the hazards and characteristics of the workgroup such as language, literacy and numeracy will influence the selection of the most appropriate controls. However there is a general principle that guides the selection of controls. This principle referred to as the hierarchy of controls or the safety decision hierarchy. It is the golden guide for reliably and cost-effectively controlling hazards. It describes the preferred options for controlling risk as follows in the order they should be considered:是什么意思？

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