他对集邮痴迷到了极点，把所有时间和金钱都花在了这上面。

He turned into a ___monomaniac about stamp collecting, spending all his time and money on it.

他对收集邮票的痴迷已经到了近乎偏执的地步，其他什么都顾不上。

His ___monomaniac obsession with stamp collecting leaves no space for anything else in his life.