She seemed doubtful about the success of the project.
她似乎对项目的成功持怀疑态度。
His response was doubtful, leaving us all uncertain.
他的回答很含糊，让我们都不确定。
The weather forecast looks doubtful for the picnic tomorrow.
明天野餐的天气预报看起来很不确定。
I am doubtful whether he will show up on time.
我怀疑他是否会准时出现。
Her explanation was doubtful and lacked evidence.
她的解释很可疑，缺乏证据。
It's doubtful that the train will arrive on schedule.
火车按时到达的可能性很渺茫。
He gave a doubtful look when asked about the plan.
当被问及计划时，他露出了怀疑的表情。
The outcome of the match is still doubtful at this point.
比赛的结果目前仍然不明朗。
She is doubtful about the authenticity of the painting.
她对这幅画的真实性感到怀疑。
His motives were doubtful, making everyone suspicious.
他的动机很可疑，让大家都产生了怀疑。
doubtful expression 怀疑的表情
doubtful circumstances 可疑的情况
doubtful outcome 不确定的结果
doubtful reliability 不可靠性
doubtful reputation 名声不好
doubtful evidence 可疑的证据
doubtful future 前途未卜
副词: doubtfully;
