to be sure片語KK [tu bi ʃʊr] /tu bi ʃʊɹ/發音片語1誠然、固然、的確用於讓步The plan is ambitious, to be sure, but it is not impossible.這個計畫誠然雄心勃勃,但並非不可能實現。2以防萬一、為求穩妥常與 just 連用I locked the door twice, just to be sure.我把門鎖了兩次,以防萬一。3哎呀、天哪舊式Well, to be sure, I never expected to see you here!哎呀,我真沒想到會在這裡見到你。