求翻译：自1872年末代大臣李鸿章派出30名少年赴美留学起，一个曾经闭关锁国的大国每年都会有一部分精英要奔赴世界各地学习最先进的科技，以期学成后回国为国家作出巨大贡献。一个多世纪之后，不仅公派留学生成了一种传统，而且自费出国留学的学生也在逐年增加。　　　　无疑，倘使这些学有所成的留学生都能回国参与国家建设，自然是件求之不得的事情。可实际情况并不乐观。据统计，1978—2008年期间，我国共有近140万留学生出国深造，结果只有38万“海归”。留学生回国人数之少的窘境已经使中国成为全球人才流失最严重的国家，而流向最多的国家就是美国。是什么意思？

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Sent out 30 youths from 1872 year's end generation of Minister Li Hongzhang's to go abroad to study in the U.S., once stopped all foreign contact the great nation could have part of outstanding people every year to have to ru

Since the end of 1872 on behalf of Minister Li Hongzhang sent 30 juveniles to study in the United States, one inter-State powers every part of the elite went to around the world to learn the most advanced technology, with a view to subsequently returned the country to make a significant contribution