Why dance, calligraphy, swimming, driving and singing will never be forgotten once you know them, while some English words will be forgotten if you don't remember them for a few days, but

There is a simple reason. As far as educational psychology is concerned, dancing, calligraphy and swimming belong to action memory, that is, procedural memory, which is generally unforgettable. English words belong to content memory, that is, declarative memory, which needs to be repeated repeatedly. The difference in memory process is caused by their different properties.