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这个积木使角色向前移动特定步数:
假设我们在输入框中填入50,就会使角色向前走50步。
如果我们改变角色的朝向,角色就会沿着新方向移动。
角色永远都不能走出播放器窗口。到达边缘就会卡住,留一个小“尾巴”让我们抓住它。