unintentionally
unintentionally(无意中), 此释义来源于网络辞典。
undesignedly
... undesigned 无意中的 undesignedly 无意中 undesirable 不合需要的 ...
overhear ; hear by chance ; hear without the knowledge of the speaker ; overhear overheard overheard
by a blow
hit on ; come across ; hit on/upon