1·When he weeded out "the most doubtful measures of aggression", only 28% supported a connection.
当他排除“最可疑的攻击手段”时，只有28%的人支持这种联系。
2·Without the Domain Name System, it's doubtful the Internet could have grown and flourished as it has.
要是没有域名系统，互联网能像现在一样成长并且兴旺发达是可疑的。
3·Under these uncomfortable conditions, it is doubtful that doctors can get accurate measurements.
在这种不舒适的条件下，医生能否得到准确的测量结果是可疑的。
4·One possibility (of doubtful legality under the Maastricht treaty) was for the EFSF to borrow from the ECB, but opposition from the central bank seems to have killed it off.
一种方式(马斯特里赫特条约下合法性可疑)让欧洲金融稳定基金从欧洲央行借钱，但央行的反对使这一建议搁浅了。
5·This is doubtful.
这很可疑。