I have doubts about the practicality of their proposal.

我怀疑他们的建议是否行得通。

《牛津词典》

Liberals have doubts about her, too.

开明的人们对她同样有疑虑。

youdao

But only Americans can vote in American elections, and many have doubts about Mr Obama.

但是只有美国人能够在美国大选中投票，而很多人仍然对他心存疑虑。

youdao

Blatter's doubts about Nigeria's hosting capacities have been made explicit in recent months, based over a year of debate and threats of moving the tournament, during which the country did just enough to avoid the embarrassment of being replaced as host.

VOA: standard.2009.10.22

Analysts say that Republicans have had some success in raising doubts about the Obama health care initiative by focusing on the impact of the plan on the growing federal budget deficit and by raising the specter of too much government interference in the health care sector.

VOA: standard.2009.09.02

And when major setbacks occur, they have doubts about whether the company can still win.

FORBES: Play to Win!

Before he was assassinated in September 1901, McKinley himself had come to have doubts about it.

NPR: 'Folly of Empire' Offers Critique of U.S. Imperialism

The ones who accept we can control immigration, but have doubts about what our reforms will mean.

BBC: In full: David Cameron immigration speech