我是rAm Charts的新手，我想知道如何在rAm折线图中有多个Y轴，请帮帮我 .

data("data_bar")
data_bar$new = c(0.8,0.9,0.5,0.9,0.6,0.4,0.8,0.2,0.1,0.5,0.4,0.7)
amBarplot(x = "country", y = "visits", data = data_bar,labelRotation 
=-45) %>%
amLines(y = data_bar$new, col = "blue")
r