What do "furnace" and "salad bowl" mean?

Melting pot: People from different ethnic backgrounds in a region bring different cultures and finally merge to form a new culture.

Salad Bowl: People from different ethnic backgrounds have brought different cultures, but they still have their own unique cultures, and the culture in this area is the sum of these cultures. reference:/q/what _ the _ difference _ in _ Ellis _ island _ and _ angel _ island