I think that we were so self-centered and pleased with ourselves that we forgot to look around.

self-centered 是由 self（自己）和 centered（以...为中心的）组成的复合形容词。self 表示"自我"，centered 来自动词 center（使集中），表示"以...为中心的"。 self-centered 意思是"以自我为中心的"，形容一个人只关注自己的需求和利益，不考虑他人的感受或处境。