“黔驴技穷”我们可以这么说：at one's wit's end, means at the limits of one's mental resources，这个俚语的意思就是没有头绪了，没辙了，不知所措，黔驴技穷了；

例如：I'm at my wit's end with this problem. I cannot figure it out. 对这个问题我已经黔驴技穷了，想不出解决办法了。