记忆方法
将“doubtful”拆分为“doubt”和“ful”。想象你有疑问（doubt），这感觉充满了（ful）。这种方法通过将形容词的“ful”后缀与原动词“doubt”的含意相结合，帮助记忆该词表示怀疑或不自信的意思。
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英语词源
- doubtful (adj.)
- late 14c., from doubt (n.) + -ful. Related: Doubtfully; doubtfulness.
权威例句
- 1. For a time it seemed doubtful that he would move at all.
- 有一段时间他似乎根本不会搬家。
- 2. Forsyth is doubtful for tonight's game with a badly bruised leg.
- 福赛斯腿部严重擦伤，不大可能参加今晚的比赛。
- 3. Whether the authorities will allow inspection is highly doubtful.
- 当局是否允许检查还是个大问号。
- 4. They also seemed of very doubtful value.
- 它们好像也没有多大价值。
- 5. Rose was doubtful about the whole idea.
- 罗斯对整个设想持怀疑态度。