U.S.top universities 是什么那么Watching online open classes U.S.top universities has become indispensable for many young Chinese.这句话怎么翻译好呢？

U.S.top universities 是什么那么Watching online open classes U.S.top universities has become indispensable for many young Chinese.这句话怎么翻译好呢？
U.S.top universities 是什么
那么Watching online open classes U.S.top universities has become indispensable for many young Chinese.这句话怎么翻译好呢？

U.S.top universities 是什么那么Watching online open classes U.S.top universities has become indispensable for many young Chinese.这句话怎么翻译好呢？
美国顶级大学

美国顶尖的大学
就是：在线观看美国顶尖（或顶级）大学的公开课程对许多中国年轻人来说变得绝对有必要。