In other words, the "raw eggs" sold on the supermarket shelves are eggs, and the "fried eggs" and "poached eggs" are Yu Zi.
Hot spring eggs are not fried or fried after being cracked, but kept intact and boiled until half-cooked. Therefore, they should be called "eggs" instead of "Yu Zi".
Eggs and Yu Zi are written in English. If egg is regarded as a whole and can be counted by one or two, then it is regarded as a countable noun. Count the yolk and protein of an egg as uncountable nouns. Actually, in Google Translation, the English translation of "egg" is Eggs, while the English translation of "Yu Zi" is eggs.