I find that Getzler and Kapranov's article(modular operad) is hard to understand for me for this concept. Can anyone explain it more clearly? For example, can we write down the explicit structure map in a twisted modular operad? Thanks!

I find Getzler and Kapranov's article Modular Operads difficult to understand. Can anyone explain what a (twisted) modular operad is conceptually, or what the underlying idea behind the concept of a modular operad is? For example, how can we write down the explicit structure map in a twisted modular operad?

I find that Getzler and Kapranov's article is hard to understand for me for this concept. Can anyone explain it more clearly? For example, can we write down its explicit structure map? Thanks!

I find that Getzler and Kapranov's article(modular operad) is hard to understand for me for this concept. Can anyone explain it more clearly? For example, can we write down the explicit structure map in a twisted modular operad? Thanks!