她的行为准则基于利己主义，认为追求个人幸福就是最高的道德。

Her moral code is based on ___egoism, believing that pursuing personal happiness is the highest virtue.

他的自私让朋友们都渐渐疏远了他。

His ___egoism drove all his friends away.

他的哲学观点倾向于唯我论，认为只有自我才是真正可知的。

His philosophical stance leans toward ___egoism, asserting that only the self can be truly known.