这是您想要的吗?

hist + geom_bar(width=0.4, position = position_dodge(width=0.5))

• width 在 geom_bar 中决定了条的宽度.
• width 在 position_dodge 中决定了每个条的位置.
• width in geom_bar determines the width of the bar.
• width in position_dodge determines the position of each bar.

也许你在和他们玩了一段时间后很容易理解他们的行为.

Probably you can easily understand their behavior after you play with them for a while.