Okay kiddo, so let's talk about frequency-resolved electro-absorption gating. This is something that helps scientists measure light waves really precisely.
You know how sometimes you can see things better in bright light? Well, scientists want to measure things like light waves really accurately, and they need to use special equipment to do that. They use something called electro-absorption gating, which helps them block some of the light so they can measure it better.
But, as you may know, light waves come in different colors - red, blue, green, and so on. So scientists need to be able to measure all of those different colors separately. That's where the "frequency-resolved" part comes in: it means that scientists can separate out the different colors and measure each one separately. They use a special device to do this, called a spectrometer.
So, to sum it up, frequency-resolved electro-absorption gating is a fancy way for scientists to measure light waves accurately and separately in different colors.