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be doubtful about

对…感到怀疑

1、对

... be distinct from 与...有差别 be doubtful about 对...感到疑惑，怀疑... be doubtful of 对...感到疑惑；怀疑...

2、疑惑的

...2. in advance of 在…的前面；在…之前；3. give up 放弃；戒除；4. be doubtful about 怀疑的；疑惑的；拿不定主意的； ...

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