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adj.令人怀疑的；可疑的
1、doubtfuls───怀疑者
2、undoubtable───adj.毋庸置疑的
3、doubtably───可疑的
4、double───adj.两倍的；成对的；（花）重瓣的；供两人用的；双重的；n.极相似的对应物；替身；供双人用的事物；双倍；（复数）双打（尤指网球）；（在同一赛季或年份两次获胜的）双料冠军；（棒球）二垒安打； (C)双精度浮点数；v.加倍；对折；det.是……的两倍；adv.双重地；重叠的；pron.双倍数（或量）；n. (Double)（美）杜布勒（人名）
5、doubtfully───adv.怀疑地；含糊地
6、double tackle───n.二重滑车
7、doubtful───adj.可疑的；令人生疑的；疑心的；不能确定的
8、redoubtably───加倍
9、redoubtable───adj.可怕的；令人敬畏的
1、Secondly, the efficiency of CCR team in responding customers' requests, questions, and complaints are really doubtable .───其次，CCR对万家的提问，请求，申诉的处理效率很有问题。
2、However, the method of taking drugs which is accepted by many athletes in doubtable .───然而，仍有许多运动员对服用药物这种方法莫衷一是。
3、But even if there was such a sword in Ming dynasty, there's something doubtable.───但即使明代有这种形制、装具的剑，这把剑还是有可疑的地方。
4、During this trial, there are many doubtable pieces of evidence which must be re-verified.───这次审判中，有许多证据有质证，需要重新核实。
5、But, referee's some assign extremely the deviation home team, is very doubtable .───但是，裁判的一些判罚太过偏向主队，很令人怀疑。
6、Second, it is doubtable whether the new tradition in modern literary theory has been formed since May 4th Movement.───第二，五四以来是否形成了现代文论“新传统”是值得怀疑的。
7、In reality, however, the authenticity of accounting information is often doubtable.───然而在现实中，会计信息的真实性却时常令人质疑。
8、This proposal whether to be accepted doubtable generally by the people.───这项提议能否被人们普遍地接受令人怀疑。