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。

youdao

If it is impracticable to comply immediately with the recommendations and rulings, the Member concerned shall have a reasonable period of time in which to do so.

如立即遵守建议和裁决不可行，有关成员应有一合理的执行期限。

youdao

This paper believes that the meaning of "Fu" in ChunQiu should be studied in a specific way, and does not agree with the vague and impracticable conclusion on them.

主张对《春秋》经传的诸多“复”字作具体分析，不赞成对它们作笼统而不切实际的结论。

youdao

In federal courts, such certification must generally follow well-established principles to ensure a lawsuit would not become so large as to be impracticable, and would allow the parties to fairly represent the common interests of the larger class of plaintiffs.

CNN: Justices accept appeal over Wal-Mart gender pay lawsuit