sure英[ʃʊə(r)]美[ʃʊr]adj.确信的，确实的; 有把握的; 无疑的; 一定的;adv.当然; 确实地; 无疑地;He'd never been in a class before and he was not even sure that he should have been teaching他以前从未教过课，甚至不确定自己该不该教课。
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