如果没有适当的资金，这样的计划能够成功是不可想象的。

It is ___inconceivable that such a plan could succeed without proper funding.

对许多人来说，一个没有互联网的世界是不可想象的。

To many, the notion of a world without the internet is ___inconceivable.

背叛朋友的想法对他来说是不可想象的。

The thought of betraying his friends was ___inconceivable to him.