Hammer hardness is something that could be adjusted in the maintenance of an actual piano.
琴槌的硬度是维护一个真钢琴时可以调整的东西。
Figure 3: Actual iteration activities during vacation, adjusted from those shown in Figure 2.
图3：假期中实际的迭代活动，由图2所示的内容调整而来。
Figure 3: Actual iteration activities during vacation, adjusted from those shown in Figure 2.
图3：假期中实际的迭代活动，由图2所示的内容调整而来。
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