to be sure片语KK [tu bi ʃʊr] /tu bi ʃʊɹ/发音片语1诚然、固然、的确用于让步The plan is ambitious, to be sure, but it is not impossible.这个计划诚然雄心勃勃,但并非不可能实现。2以防万一、为求稳妥常与 just 连用I locked the door twice, just to be sure.我把门锁了两次,以防万一。3哎呀、天哪旧式Well, to be sure, I never expected to see you here!哎呀,我真没想到会在这里见到你。用这个字练口说→