1. Be doubtful of investment 
   对广告有疑虑
2. A report of doubtful veracity. 
   真实性可疑的报告
3. He was doubtful of the outcome. 
   他对于结果没有信心。
4. Of a doubtful or uncertain nature. 
   不确定的性质上有疑问或不确定的
5. The judge is of the opinion that if the evidence is doubtful the claim shall be dismissed. 
   法官持有这样的看法：如果证据有疑，要求应不予受理。

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• 1. 怀疑
  be doomed to || 注定...be doubtful of || 怀疑...be down and out || 被击倒而停止比赛, 穷困, 潦倒
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• 2. 对……怀疑
  He was dismissed because he was devoid of talent.他被解雇了因为他缺乏才能。...21.be doubtful of对……怀疑
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• 3. 懷疑
  (B)doubtful a. 懷疑的...be doubtful of...　懷疑……...例： Please don't be doubtful of my intentions.
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