🔑un·cer·tainBrE/ʌnˈsɜːtn/NAmE/ʌnˈsɜːrtn/adjective🔑[not before noun]~ (about/ofsth)feelingdoubtaboutsth; notsure无把握;犹豫;拿不准◆They'rebothuncertainaboutwhattodo. 他们两人都拿不定主意该怎么办。◆I'mstilluncertainofmyfeelingsforhim. 我仍不能肯定我对他的感情。OPPcertainExpressing certainty or uncertainty表示确定或不确定
When you are stating what has happened or is going to happen, you can say how certain or uncertain you are about what you are saying.陈述已经或将要发生之事时对自己所言表示确定或不确定:
◆I'm sure/100% certain/absolutely positive I left my keys on the table.我肯定我把钥匙落在桌子上了。
◆There's no doubt in my mind that this is the best option.我心里确信无疑,这是最佳选择。
◆Without a doubt,/No question, this is where it was.毫无疑问,它原来就在这里。
◆I'm not (at all) sure what time they arrive, to be honest.老实说,我(一点也)拿不准他们什么时候到。
◆I rather doubt they'll call back. (BrE) 我有点儿怀疑他们是否会回电话。