know no bounds
无边无际
书面·形容情感或行为无限
英文释义
to have no limits or boundaries; to be limitless or boundless
例句
Her enthusiasm for helping others knows no bounds; she's always volunteering.
典故来源
源自中世纪英语，指某种情感或品质没有限制，常用于形容爱、野心等抽象概念。