When I was first learning about OO concepts, I was doubtful that interfaces were really helpful.
在我最初了解OO概念时，我十分怀疑接口是否真正有帮助。
He hopes they were happy about his success as a novelist but remains doubtful.
他希望父母为他感到自豪，生活的快乐，但是有时他还是有些怀疑。
He hopes they were happy about his success as a novelist but remains doubtful.
他希望父母为他感到自豪，生活的快乐，但是有时他还是有些怀疑。
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