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    under-

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    under-
    under- /ʌndə $ -dər/ prefix
    1. less of an action or quality than is correct, needed, or desired:
        underdevelopment
        undercooked cabbage
    2. going under something:
        an underpass (=a road or path that goes under another road)
    3. inside or beneath other things:
        undergarments
    4. less important or lower in rank:
        a head gardener and three under-gardeners


    under-BrE /ˈʌndə(r)/ 🔊NAmE /ˈʌndər/ 🔊 prefix (in nouns and adjectives 构成名词和形容词) below; beneath 在下面；在…之下◆undergrowth下层灌木丛◆undercover暗中的 (in nouns 构成名词) lower in age or rank （年龄）较小；（级别）较低◆the under-fives五岁以下的儿童◆an undergraduate大学生 (in adjectives and verbs 构成形容词和动词) not enough 不足；未◆underripe未成熟的◆undercooked未煮熟的<titled tranID="1" status="2">Expressing certainty or uncertainty<chnsep> </chnsep><chn>表示确定或不确定</chn></titled>

    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。