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一、详细释义：
adj.
可疑的，不可靠的，有问题的，不确定的
例句：
The hope of high profits lured him into questionable dealings.
获取高额利润的欲望诱使他从事可疑的勾当。
例句：
It is questionable whether it is true.
它是否真实值得怀疑。
二、词义辨析：
questionable,doubtful,ambigous,uncertain
这些形容词均含“怀疑的，不确定的”之意。questionable通常指怀疑某行为是否恰当，或指有根有据的怀疑。doubtful指对某个问题持积极怀疑的，有疑问的态度，强调缺乏确信。 ambigous指因缺乏明确感或因为有各种不同的解释而值得怀疑。uncertain多指因缺乏证据或了解而捉摸不定，也指因不能预料而不能作出选择。
三、参考例句：
It is questionable whether it is true.
它是否真实值得怀疑。
The theory is bottomed on questionable assumptions.
这一理论是建立在靠不住的假设基础上的。
It's questionable whether she told him.
她有没有告诉他还是个疑问。
The desire for wealth lured them into questionable dealings.
他们受了发财欲的引诱而被卷入可疑的交易。
They are already horribly exposed to questionable government projects.
那些有问题的政府项目，已经让他们暴露于可怕的风险。
The hope of high profits lured him into questionable dealings.
获取高额利润的欲望诱使他从事可疑的勾当。
There are still a few questionable points in the case.
这个案件还有几个疑点。
It's questionable whether anything of substance has been achieved.
是否已取得任何实质性的进展值得质疑。
Such a questionable assertion is sure to provoke criticism.
这种有问题的主张肯定会招致非议。
They even yelled at the referees each time there was a questionable call.
在判决出现争议时，他们还对裁判大吼大叫。
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