The investigation has been going on for months, and we're still none the wiser about the true cause of the accident. [=we still don't know anything more about the true cause]调查持续了数月，但我们现在仍不清楚事故发生的真正原因。

I borrowed his car and returned it, and he was none the wiser. [=he did not know that I had borrowed his car]我借了他的车并把车还回去了，可他竟然完全不知道我曾向他借过车。

We left early, and no one was any the wiser. [=no one noticed that we had left]我们提早离开了，没有人注意到。