Their plan is merely a castle in the air because it is simply impracticable.
他们的计划不过是空中楼阁而已，因为它根本行不通。
It's evident that the plan is impracticable.
很明显这个计划是不能实现的。
He will have it that our plan is impracticable.
他会坚持说我们的计划行不通。
They hold the plan to be impracticable.
他们认为这个计划不切合实际。
He will probably have it that our plan is impracticable.
他可能会说我们的计划不切实际。
He will probably have it that our plan is impracticable.
他可能会说我们的计划不切实际。
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