in vain   (TTS發音)

without success；without effect徒勞地；無效地

    He passed his life in vain. 他虛度了一生。

    The drowning man called in vain for help. 溺水者求救無門。

    All the doctor's efforts were in vain and the man soon died. 醫生所有的努力都無效，那個人很快就死了。