1·When software development teams move to agile methods, experienced project managers often struggle — doubtful about the new approach and uncertain about their new roles and responsibilities.
当软件开发小组转向敏捷方法时，有经验的项目管理人员通常与他们斗争——怀疑新的方法以及不确定他们新的角色和职责。
2·They are able to get you into negative state of mind very quickly, therefore you may become doubtful about wanting to change.
他们能很快把你拉到消极的国度里面，从而你可能开始怀疑，是否想要改变。
3·I was feeling a bit doubtful about my ability to write a drama in less than a week.
我置身公园，现在开始怀疑我是否能在一周内写出一个戏剧来。
4·I am rather doubtful about his real motive for doing this.
我颇怀疑他做此事的动机。
5·Paula Heimann wrote in the margins of a reprint of this paper that she felt doubtful about including it in her Collected Papers.
海曼在这篇论文再版的空白处写了这些，她感到怀疑，包括在她的论文集中。