Definition
Something desirable that is perpetually promised but never materializes.
空头支票
The government keeps promising us better healthcare, but it always turns out to be jam tomorrow.
政府一直承诺我们会有更好的医疗保健，但结果总是空头支票。
The company said we'd get big bonuses next year if we worked hard this year, but it sounds like jam tomorrow.
公司说如果我们今年努力工作，明年就会有大笔奖金，但听起来像是空头支票。
They kept saying they'd have more time to do what they wanted when they retired, but it feels like jam tomorrow.
他们一直说退休后会有更多时间做想做的事，但感觉像是空头支票。