› Someone or something world-class is one of the best that there are of that type in the world:
a world-class athlete/performance
(world-class在剑桥高级学习词典和同义词词典的解释 ©剑桥大学出版社)
“每日一词”
altruistic
showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself