I have some words where I'm only studying two or three parts of the word.
富有 and 迈克尔杰克逊 being two that I've noticed which have been on my active lists more than long enough to have had all four parts added.
It used to be if I noticed I was missing a part, I'd just go into "my words" and click on the green plus sign next to whatever part wasn't being studied. Only, I can't figure out how to do that anymore...
Help.