| 21. | Though we may enjoy reading about the lives of others, it is extremely doubtful whether we would equally enjoy reading about ourselves. |
| 我们都喜欢看关于别人生活的报道，但是否同样喜欢看关于自己生活的报道，就很难说了。
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| 22. | It is doubtful whether the reformed spelling will obtain [find] general acceptance. |
| 这种改革的拼法是否能被人们普遍接受令人怀疑。
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| 23. | It is doubtful whether the present concrete buildings will successfully pass the test of time. |
| 现有的这些混凝土建筑物是否能成功地经受住时间的考验还难以预料。
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| 24. | It is doubtful if the theory will still hold. |
| 这学说是否仍适用令人怀疑。
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| 25. | The weather is doubtful . |
| 天靠不住。
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| 26. | a doubtful ally |
| 不可靠的盟友
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| 27. | a rather doubtful character, neighbourhood,past |
| 很可疑的人物, 邻居, 过去
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| 28. | embark on a risky, doubtful , etc venture |
| 从事一项冒险的, 成败未卜的
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| 29. | a doubtful advantage |
| 靠不住的优势；不确实的利益
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| 30. | doubtful appearance |
| 可疑的表象
|