You use imaginable after a superlative such as 'best' or 'worst' to emphasize that something is extreme in some way.
例句
...their imprisonment under some of the most horrible circumstances imaginable...他们被关押在可以想象出的最恐怖的环境中He could not disguise that he had had the worst imaginable day for any minister.他刚刚经历了对于任何部长而言都是最糟糕的一天,这对他来说无法掩饰。
ADJ
(用于 every,all 之后,表示强调)(一切)可能存在的,(一切)可能发生的;(用于 no 以后)根本
You use imaginable after a word like 'every' or 'all' to emphasize that you are talking about all the possible examples of something. You use imaginable after 'no' to emphasize that something does not have the quality mentioned.
例句
...all of the other imaginable ramifications of this technology...这项技术可能产生的其他一切后果Parents encourage every activity imaginable.父母鼓励孩子参与一切可能的活动。
英汉词典释义
adj.
可想像的;想像得到的
We have been inundated with every bit of information imaginable.凡是想得到的各种各样的信息潮水般地向我们涌来。