[Pgfplots-features] Double y axes chart

[Li Y. <lyj...@16...>]

I want to plot a chart with two series date. As one serie date is too biger than another, so I want to draw double y axes, one is on the left of chart and the other on the right. One serie date plots based on the left y axes, and the other based on the right y axes. Is there any way to slove it?