望洋兴叹wàng yáng xīng tàn本义指在伟大的事物面前感叹自己的藐小{lament one's inadequacy in the face of a great task}今多比喻要做一件事而力量不够,感到无可奈何{(fig.) feel powerless and frustrated at the thought of so much difficulty}(望洋{wɑngyɑng}: 抬头向上看的样子{raise one's head and look at the sky})。