The word "firmly" in the excerpt emphasizes the father’s skill and control in his labor, reflecting stability and mastery rather than burden. It indicates that the father approaches his work with confidence. Therefore, it suggests that he works with skill and control. ;
The word "firmly" highlights the father's skill and control as he works with confidence. It indicates stability and mastery over his labor rather than suggesting any burden. Therefore, the best explanation is that it shows the father works with skill and control.
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