wàng yáng jīng tàn
◎望洋兴叹 wàngyáng-xīngtàn[lament one's littleness before the vast ocean -bemoan one's inadequacy in the face of a great task] 本义指在伟大的事物面前感叹自己的微小,今多比喻想做一件事而又无能为力,无可奈何。