So, things like allegro, allegretto, crescendo, diminuendo are all Italian words, which musicians understand, even though they're not in their own language.

所， Allegro（快板）、Allegretto（小快板）、Crescendo（渐强）、Diminuendo（渐弱）这样的术语都意大利语词汇，尽管它们不家自己的语言， 但他们都能理解。