on the go idiom
忙个不停的，特别忙的
very busy
I've been on the go all day, and I'm really tired. 我一整天都忙个不停，真的很累。
UK正在生产中，处于生产过程中
in the process of being produced
Did you know that she's got a new book on the go (= being written)? 你知道她正在写一本新书吗？