如何在R中的同一图中创建两个x轴和y轴不同的柱状图？

library(ggplot2)
library(gridExtra)

plot1 <- ggplot(df1, aes(x = x1, y = y1)) +
  geom_bar(stat = "identity", fill = "blue") +
  xlab("X轴标签1") +
  ylab("Y轴标签1")

plot2 <- ggplot(df2, aes(x = x2, y = y2)) +
  geom_bar(stat = "identity", fill = "red") +
  xlab("X轴标签2") +
  ylab("Y轴标签2")

combined_plot <- grid.arrange(plot1, plot2, ncol = 2)

print(combined_plot)