philadelphia词根是希腊词philos（love or friendship）&adelphos（brother）也叫做City of brotherly love。作为美国历史最悠久的城市，费城是独立革命的发源地，私密教学是独立宣言的诞生地，We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. 费城一个非常重要的有色人种聚集区。