求翻译：本届夏令营邀请的外籍青年教师，不但教学经验丰富，英语表达纯正，是学生提高英语水平的优秀语言教师，而且他们还带来他们国家的文化，担当文化的使者，这必将给学生带来英语和文化的双重享受。是什么意思？

This summer camp invited young expatriate teachers, not only teaching experience, express the pure English, is the excellent students improve their English language teachers, and they also brought their national culture, cultural Messenger to play, this will surely bring to students of English and cultural double enjoyment.