I was still very doubtful about our chances.我对我们的胜算依旧深表怀疑。
They were doubtful about the technology.他们对这项技术表示怀疑。
英汉双解词典包含368430条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。