doubtful of

基本解释

I don't think we were ever doubtful of the success of this event today, a government spokesman told reporters.
一名政府發言人在接受記者採訪時說：“我們從沒懷疑今天的活動能取得成功。
And if you do take one, you'll probably make the shop assistants feel unease, they might be doubtful of your intentions.
倘若你自己帶著拎包進店，反倒會使店家覺得不踏實，沒準會懷疑你是扒手呢！
I was doubtful of the merits of such restrictions, but then this may have been the only way to cut off the power demand for money.
我儅時對他的約束辦法有懷疑，但也認爲可能是斬斷權力借貸的唯一辦法。

"Well they certainly will be doubtful of it unless President Obama makes a strong argument.
But some are doubtful the reforms will work. Boston University School of Law professor Cornelius Hurley.

Even as Haitians have been outraged by Minustah's wrongdoing, they have become increasingly doubtful of the benefits it provides.
ECONOMIST: The UN in Haiti
The driver, doubtful of the whole affair, stood by while the father and son lifted Nawab and the motorcycle thief into the back.
NEWYORKER: Nawabdin Electrician