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如果不是不可能
1、if so if not───如果是，如果不是
2、not if───如果不是的话
3、if not───如果不；不然的话；要不，不然; 若非
4、nothing if not───尤其，极其，极端
5、no if not───如果没有，就不要
6、if not now───如果不是现在
7、if not more───如果没有更多
8、if or not───是否
9、impossible───n.不可能；不可能的事；adj.不可能的；不可能存在的；难以忍受的；不真实的
1、But this is difficult, if not impossible.───但是这几乎是不可能达成的目的，很困难。
2、Sometimes that standard is quite difficult, if not impossible, to achieve.───有时那个标准，即使并非不可能，也是很难达到的。
3、That lack of curiosity produces a relative lack of knowledge, and the lack of knowledge is difficult if not impossible to compensate for later on.───这种好奇心的缺乏导致了知识的相对缺乏，而知识的缺乏以后也很难弥补，即使不是毫无可能。
4、Breaking existing attention silos and creating a real attention economy appears to be a complex, if not impossible task.───打破现有的注意力仓库，创造一个新的注意力经济似乎是一个很复杂甚至是不可能实现的任务。
5、It's difficult if not impossible to put an adequate price on such a contribution to people's lives and to society in general.───这些人为人类生活和社会整体作出了巨大贡献，如果不能给予他们恰当的回报，问题将十分严重。
6、Predicting the return on the stock market over a few years is difficult if not impossible, but predicting it over the long term is easier.───即使可能，预测几年内的股市盈利是有困难的，但是预测长线回报则简单一些。
7、Images on the Internet and sources that are often difficult, if not impossible to verify with any sense of certainty.───互联网上的图片和来源，往往是困难的，如果不是不可能与任何意义上的确定性，以验证。
8、Getting exact numbers for the amount of money paid out in bonuses is difficult, if not impossible.───若想得到确切金额，即使并非不可能，也是很难的。
9、But it's extremely difficult at the moment, if not impossible, to leave him out.───但是目前让他休息非常难，如果不是不可能的话。
1、Such mental attitudes are difficult, if not impossible , to change.
2、It is therefore highly improbable if not impossible that recent damage to a roof would have caused rot in underlying timbers.
3、It is difficult, if not impossible, to de-escalate theoveruse of that authority.
4、Sometimes, that standard is quite difficult, if not impossible, to achieve.
5、So it would be hard, if not impossible, for worker representatives to mobilize the work force against the employers.
6、Israel would, after all, find it hard if not impossible to winkle out every last rocket and martyr.
7、Without easy access to wealthy first world markets, economic development is difficult if not impossible in the second and third worlds.
8、It is very difficult if not impossible to detect the interception of a satellite transmission.
9、The snow was now two feet deep, making it difficult, if not impossible, to get the car out.