对…不能确定; 对…怀疑

doubtful about的用法和样例：

例句

I am doubtful about the value of your proposal.我怀疑你的提议是否有价值。
I am doubtful about the propriety of granting such a request.我怀疑答应这项要求是否合适。
I'm rather doubtful about his integrity.我对这事的忠诚颇有怀疑。
Because of a long drought, the farmers are doubtful about the prospect of a good yield.因为长时间的干旱，农民们对于好收成的前景是怀疑的。

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