doubtfully

例句：

1. 1. He doubtfully agreed to the proposal.
   他怀疑地同意了提议。
2. 2.She doubtfully wondered if she could make it there on time.
   她怀疑地想知道她是否能准时到达那里。
3. 3. The scientist doubtfully examined the results of his experiments.
   这位科学家怀疑地检查了他的实验结果。