lost cause

Trying to help him to improve his pronunciation is a lost cause.

想帮他纠正发音，那肯定没什么用。

Every bat flying out of the belfry a lost cause, every whoopla a groan over the radio from the private trenches of the damned.

每只飞的骗幅都是失败的事业，每欢都是注定要死的人从单人战壕里通过无线电台发的呻吟。