Yun云2870
无疑的英语单词是doubtless; undoubteddoubtless[英][ˈdaʊtləs][美][ˈdaʊtlɪs]adv.无疑地; 确定地; 多半; adj.无疑的; 确定的; But we'll doubtless have to settle for two weeks in a tent. 但是我肯定能在帐篷里面待两周就可以了.undoubted[英][ʌnˈdaʊtɪd][美][ʌnˈdaʊtɪd]adj.无可置疑; 无疑的，肯定的; 确实的，真正的;
墨墨姐姐
certain 英[ˈsɜːtn] 美[ˈsɜːrtn] adj. 确实; 确定; 肯定; 确信; 无疑; (不提及细节时用) 某事，某人，某种; pron. (不提及人或事物的名称时用) 某些;[例句]She's absolutely certain she's going to make it in the world她坚信自己会出人头地。[其他] 比较级：more certain 最高级：most certain
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