To be vain of one's rank or place is to show that one is below it.

凡因自己的地位而觉得了不起的人，就表明他不配有这样的地位。

youdao

Years ago, when I was a boy, you met me, flattered me, and taught me to be vain of my good looks.

多年前，当我还是个孩子的时候，你遇到了我，奉承我，并且教我为自己的姿容感到自豪。

youdao

But surely if a man's world be the sum of his sensible perceptions, he has no reason to be vain of such a world.

但假如他的世界只是一堆感觉印象的聚集体，那么他就没有理由以这种世界自豪。

youdao

Still, those at the Fed are nothing if not hubristic, and they'll surely try in vain to be ahead of collapsing markets despite their inability to predict them in the past.

FORBES: Magazine Article

But, given the swarm of vain consumers out there, hard proof may not be prerequisite for success.

FORBES: Magazine Article

But given the swarm of vain consumers out there, hard proof may not be a prerequisite for success.

FORBES: Technology