simmechanics中的first generation和second generation有什么区别

first-generation
英[?f?:st?d?en??rei??n]美[?f?st?d??n??re??n]
adj.
出生在美国的
网络
第一代

例句
And he's made his money on his own: 80% percent of american's millionaires are first-generation rich.
他的财产是靠自己挣来的：80%的美国百万富翁是第一代致富的。本回答被提问者采纳