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1·The success of the system is not in doubt.

这种制度的成功确定无疑。《牛津词典》

2·Then steam power entered the scene, putting the whole future of waterpower in doubt.

随后，蒸汽动力登上了历史舞台，让整个水力发电的前景一度遭到了怀疑。

3·The outcome was still in doubt.

结果仍不确定。《柯林斯英汉双解大词典》

4·His inclusion in the team is in doubt.

他是否能被选入这个队还未定案。《牛津词典》

5·His intellect and mental agility have never been in doubt.

他的才智和头脑的敏锐从未被受到怀疑。《柯林斯英汉双解大词典》

6·All the time you are in doubt about the cause of your illness, you are fighting against an invisible enemy.

一直以来你都在怀疑自己的病因，你是在和一个无形的敌人斗争。《柯林斯英汉双解大词典》

7·As the boy stood in doubt, Durbeyfield put his hand into his pocket, and produced a shilling (a unit of money used in Britain until 1971).

男孩站在那里犹豫不决的时候，德北菲尔德把手伸进口袋，拿出一先令（1971年前在英国使用的货币单位）。

8·When in doubt, use your own gear.

如果有疑问，请使用自己的装备。

9·I'm rather in doubt about his explanation of this question.

我对他对这个问题的解释相当怀疑。

10·The identity of the moai builders was in doubt until well into the twentieth century.

摩艾石像的建造者的身份直到20世纪才得到确认。