메뉴, 버튼, 안내 문구에 적용돼요.학습 콘텐츠는 영어로 유지돼요.
/ˈjuːsfl̩ əz tɪts ɔn eː ˈbʊl/
completely useless or ineffective
“That broken tool is as useful as tits on a bull.”
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