杯水车薪 [bēi shuǐ chē xīn]
1 用一杯水去扑灭一车燃烧的柴草。比喻力量太小,无济于事。
例 犹以一杯水,救一车薪之火也。——《孟子·告子上》
英 a cup of water can't put out the fire on a carload of wood; try to put out a burning cartload of faggots with a cup of water—an utterly inadequate measure;
1 亦作“杯水舆薪”。