doubtful about造句

I'm rather doubtful about its reliability.

Some jewelry experts remain doubtful about diamond investing.

Because of a long drought, the farmers are doubtful about the prospect of a good yield.

Faced with the differences of opinions, we should be open with each other rather than feel doubtful about one another.

When software development teams move to agile methods, experienced project managers often struggle — doubtful about the new approach and uncertain about their new roles and responsibilities.

Paula Heimann wrote in the margins of a reprint of this paper that she felt doubtful about including it in her Collected Papers.

While some of the second-tier candidates sounded doubtful about free trade, Mr Thompson defended it, though he used the phrase “free and fair trade”, which means different things to different ears.

Laziness is a strange thing. It makes you think it is easy, rest, and blessed, but in fact it gives you boredom, burnout, depression, it deprives you of the hope of the future, cuts off the friendship between you and others, makes your heart narrower and more doubtful about life.